Today I got the opportunity to conduct another phone interview with a radio amateur who served in World War II. The gentleman has been a licensed ham for 72 years and still has an active license. I found his name in a pre-World War II QST. He’d written a letter after he’d answered the call to duty and had been sent to Fort Monmouth, NJ to undergo training in the Signal Corps. His letter to QST laid out the process of what a ham would experience once he made the jump from the civilian world into the Army. I wanted to ask him about his experiences during training, had there been other hams in his unit? Did his amateur radio skills help him become a better Army signalman? Where was he sent after Fort Monmouth? Europe… the Pacific? The gentleman had served his country along with our greatest generation and I wanted to honor his service by hearing his war stories. Unfortunately the years had eroded his memories and he couldn’t recall much more than that he had been in the Army for five years and had briefly served at Fort Monmouth. He immediately recalled his holding of an amateur radio ticket for 72 years and it was heartening to think that amateur radio had played a major part in his long life. I sincerely thanked him for his service to our nation but was somewhat saddened by the fact that his wartime experiences are lost in the shadows of history.
Category: army
YI9PSE: April 2010 operation in Iraq
Here is an interesting announcement from: www.yi9pse.com
YI9PSE is the first DXpedition to Kurdistan.
The YI9PSE team has received the approval and blessing of the Kurdistan Regional Government to conduct the first DXpedition from Kurdistan. The YI9PSE team has been invited to demonstrate amateur radio to the Kurdistan Regional Government Ministry of Interior officials, who will visit and observe the YI9PSE DXpedition team in action.
We hope to have a signal on the air late in the evening of the 2nd, and we must tear down our station on the evening of April 11th. We will have ten day visas issued by the Kurdistan Regional Government.
The Kurdistan Regional Government officials are very excited to learn more about amateur radio and see the first DXpedition from Kurdistan take place. They have reviewed, approved of our plans and blessed our operation.
Thank you,
The YI9PSE DXpedition Team.
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For those not in the know, Kurdistan is the northern portion of Iraq and the Kurds consider themselves an autonomous entity – which is seen as a contentious concept by the rest of Iraq (Turkey and Iran are also not excited about the idea of a “Kurdistan”). While I applaud the team’s effort, I question the judgment of an operation like this. I wish these gentlemen the best of luck and hope they remain safe but I think they are unnecessarily putting themselves in danger (although I would probably go with them if I had the opportunity).
Windom and The Army Amateur Radio System
I found out today that the primary designer of the off center fed antenna, also known as a Windom antenna was a member of the National Guard and a founder of an early version of the Army Amateur Radio System (AARS) back in 1923. The gentleman’s name is Loren G. Windom. His individual initiative helped push the development and success of the AARS.
Army Amateur Radio System
I am closing in on the end of my research concerning the history of MARS, focusing on the early years when the organization was known as the Army Amateur Radio System (AARS). I choose this as a research topic because no one has ever written a thorough history of MARS.
Dr. Paul A. Scipione, AA2AV, wrote MARS: Calling Back To ‘The World’ From Vietnam (The History of Military Affiliate Radio Systems Operations During the Vietnam War) which was published back in 1994. This hard to find book was truly a labor of love for Dr. Scipione, who had served as a soldier and MARS operator during the Vietnam War. He conducted countless interviews with soldiers, sailors, airmen, Marines, and civilians who were involved in MARS during the length of the US involvement in Vietnam. He also conducted some initial research concerning the early days of MARS, prior to WWII. The majority of his research concerning MARS early history was done at Fort Monmouth, NJ, the location of the US Army’s Signal Corps School from pre-World War I to post-World War II. His primary source was QST which reflects a very ARRL flavored version of the AARS history. Army MARS currently uses an abbreviated version of Scipione’s history on their website:
In November, 1925, the Army Amateur Radio System (AARS) was initiated by a few dedicated pioneers in the United States Army Signal Corps led by Capt. Thomas C. Rives. His original intention was to enlist the talents of volunteer Amateur Radio operators as a source to train Soldiers in the then new technology of radio as well as pursuing radio research and development to improve radio equipment within the Army. His efforts were very successful.
This organization continued until the United States entry into World War II, at which time radio Amateurs were denied the use of the air. Therefore, the activities of AARS, as it was known, were suspended until 1946 when, once again, AARS was allowed to go back on the air. During the years 1925 through 1942, the AARS functioned more or less as an extra curricular activity of the U. S. Army Signal Corps, its scope being necessarily limited by the meager budget of the pre-World War II depression years. The best available figures indicate that as of the 7th of December, 1941, there were approximately 60,000 FCC licensed Amateurs within the United States and its possessions. Some 5600 of those Amateurs were members of the AARS. About 20% of the pre-World War II AARS members eventually entered the service of their country either in the Army or in a civilian capacity. The U. S. Army recognized the great importance of reactivating the AARS to train vitally needed communications personnel at a relatively inexpensive direct cost to the U.S. government. Therefore, in 1946, the AARS was reactivated and functioned as such until the creation of the Military Amateur Radio System in 1948, later renamed the Military Affiliate Radio System (MARS) with Army MARS and the newly formed Air Force MARS reflecting the creation of the Air Force as a separate service. In early 1963, the Navy-Marine Corps MARS was established.
From my research: AARS was officially constituted in November 1925, although the seeds for the organization had been planted a few years earlier. Both the ARRL and the Signal Corps had different motives for the founding of AARS. The ARRL was looking to affiliate with a government organization in order to ensure the radio amateurs continued to have the freedom to use the airwaves. Coming out of WWI, the ARRL was blindsided by the US Navy when it initially made a grab at permanently taking control of the radio spectrum. The ARRL proved to be an effective lobby and successfully persuaded Congress to maintain the status quo of the Radio Act of 1912, which gave the radio amateur his on-air privileges. The next fight was against commercial interests as broadcast radio skyrocketed in popularity. The ARRL knew that by affiliating with the Army, they could clearly justify the radio amateur’s continued access to the ham bands.
In the early 1920s, the Signal Corps was attempting to stand up a near-global radio system which came to be known as the War Department Radio Net. The hub of the net was based out of the Washington D.C. area and the other major nodes were located in each one of the nine corps areas.
This net grew to include Alaska, Hawaii, the Panama Canal Zone, and the Philippine Islands. The Army lacked a large number of radio operators and soon faced budgetary and personnel cuts in the mid-1920s. Additionally, the Army was also looking at long term requirements. They realized the time required to draft and train the amount of radio operators that would be required for a major mobilization would be prohibitive. The Army viewed an affiliation with the ARRL and the American radio amateur as a possible solution to their short and long term manning issues.
While CPT Rives was stationed at Fort Monmouth during this period and a very active radio amateur, he was not the driving force behind the creation of AARS. The Army never saw the radio amateur as an asset to be used in helping with training at the Signal School. The Signal School was very progressive in its implementation of radio innovations and heavily leveraged the faculty at nearby MIT for technical assistance in addition to the school’s military staff.
Between 1925 and 1941, AARS was successful in training many amateur radio operators in Signal Corps procedure. Participation in AARS nets trained the radio amateurs in use of Army ciphers, how to pass message traffic, and net procedure. AARS members often provided aid during natural disasters, providing a link between local, state, and the national government. During the 1930s, AARS frequently teamed with the Civilian Conservation Corps (CCC) camps to provide a radio link. The MARSGrams that became very familiar to soldiers during Vietnam can be traced back to the support provided members of the CCC sending messages back home. During the summer of 1941 as the US Army began its expansion for the coming war, AARS members operated directly from Army camps in order to pass messages from the soldiers back to their families.
While the Army had done an excellent job at training the AARS in Army communication procedures, it never was able to formally place the AARS members in any type of reserve status were they could be called up to active duty. No organized system was used to track membership and no plan was made to attempt to draft the AARS members into the Signal Corps. The AARS membership figure of 5600 is not accurate. Active membership during 1941 was at ~1200 with about 2000 inactive members.
The day after the attack on Pearl Harbor, AARS evaporated. Members were encouraged to join the Army and promised placement in the Signal Corps. Compliance with this request was not universal. Not immediately seeing a use for AARS in a civil defense roll was shortsighted. The AARS could have served as a basis upon which to build the Wartime Emergency Radio System (WERS). Instead, the organization was scraped and it was hoped that they would seek placement in the Army.
Radio amateurs served in the US military in large numbers, but the vast majority were never prior members of AARS. National Guard units had consistently leveraged the use of radio amateurs who were members of their units to perform radio communication functions. For those radio amateurs drafted into the Army, their placement in a radio position was not assured.
AARS, during its existence, was a truly valuable organization – not an extra-curricular activity for the Signal Corps. Had the Army better managed the program and personnel, they would have derived much more benefit from the organization while on a wartime footing.
In addition to using QST as a source, I also used The Signal Corps Bulletin which was the professional journal of the Signal Corps up until 1940. The Signal Corps Bulletin provided a great deal of insight from the Army perspective concerning AARS, their development, and interaction with the CCC, National Guard, and the rest of the Army.
I continue to write my paper and am hoping to have a solid draft by next Friday. I am going to take the history a bit further – to just after the reconstitution of AARS as MARS in 1949 and then follow MARS up to 1953. If you are trying to find me in the coming days, chances are I’ll be at the Fort Leavenworth library, swimming in my notes as I try to tell the story of MARS in about 50 pages.
Final Statement Of An Infamouse Booze Hister
The Signal Corps Bulletin was the professional journal of the US Army’s Signal Corps from 1920 to 1940. After the establishment of the War Department’s radio net, a section was included in the back were individual stations could make comments about their equipment, personnel transfers, and sometimes snipe at rival stations. Station WAR, located at Ft. Meyer, VA (near Washington D.C.) was net control for the net that reached all the way out to San Francisco, Seattle, Alaska, Hawaii and even the Philippine Islands. The following is taken from a Bulletin from the late 20s which I found pretty amusing:
It is with great regret that I leave members of the radio station and take this means of expressing to each and every one my hearty appreciation of the many kind favors and good fellowship shown by all during my stay. I wish you all a Merry Christmas and for the New Year may you all be staff sergeants. I shall always hold a warm spot in my heart for the members of this outfit and if at any time one of you needs succour don’t call on me because I will probably be broke too.
Usually when leaving a station it has been my practice to donate my sign to some member of the station to filly able to hold up the traditions of this fine old sign so I hereby solemnly will bequeath my sign to A to operator TN as he has been wanting a good sign. The sign may only be accepted by TN on the following conditions: 1. That he will discontinue all prevarications. 2. Discontinue the practice of bumming cigarettes or smoking butts. 3. Will not try to get excused from duty through subterfuge such as a lame wrist or shoulder.
When I am again battling the bitter cold and nearly unconquerable obstacles of the primeval wilds of the northland and my tea is running low and I am completely out of whiskey I will be cheered and spurred on to greater efforts by the thought that I am an ex-member of the undefeatable gang at WAR. I am crying so much that I can not see to write more. Goodbye. – Avery
(Former operator WAR now en route to Alaska)
NOTE: a booze hister was defined back in those days (of Prohibition) as a drunkard.
Chasing MARS…
I’m continuing my research of piecing together the history of MARS starting back from the early days of the Army Amateur Radio System (AARS). The process of research is as enjoyable as the information I’m digging up.
– Jeff, KE9V, had a post on his blog the other day that featured a humorous cartoon of different styles of keying and he sited it from a 1952 MARS Bulletin. The “MARS Bulletin” reference caught my eye, because I had not yet heard that there was such a bulletin. Additionally, the time frame of the bulletin in 1952 was near the time when MARS had been reincarnated from the ashes of the pre-WWII AARS. Jeff said he had got the picture from Dr. Kristen Haring’s book Ham Radio’s Technical Culture, published back in 2006. I contacted Dr. Haring (she’s a professor at Auburn University) and asked if she could provide me any additional information on the MARS Bulletin. Dr. Haring told me that she had accessed the MARS Bulletin while conducting research at both the Library of Congress and Columbia University’s library. She also recommended a search tool called WorldCat to help locate copies of the MARS Bulletin nearby. WorldCat is a great tool (it would have been helpful to have had this earlier on in my research) and I was able to locate copies of the Bulletin at the Linda Hall Library of Science, Engineering and Technology located in nearby Kansas City (with the next closest source at Indiana University which is some distance away). The library here at Fort Leavenworth is top notch – its official title being the Combined Arms Research Library.
But I am sometimes surprised that they lack items like the MARS Bulletin. Tomorrow I will head down to Kansas City and see if the MARS Bulletin can help explain why MARS was resurrected after WWII and what was the military’s intended mission for the organization.
– Following another lead for QST, I found a letter to the editor in the October 1998 issue from a gentleman by the name of Robert Gabardy, K4TJ. In the letter, Mr. Gabardy explained how he was part of a team which formed to bring MARS back to life back in 1949 and explained how they arrived a the new name for the organization. I was able to contact the retired Lieutenant Colonel Robert Gabardy, who served in the US Army for a period of over 23 years and is a veteran of WWII. He was able to give me a bit more background and also agreed to respond to some additional questions that I am developing.
– My last hot lead comes from another QST letter to the editor from the June 1998 issue that had caused LTC Gabardy to write in. This letter was from George Hart, W1NJM, a former staff member of ARRL… but also a former member of the AARS and also an Army veteran of WWII. From what I can tell now, Mr. Hart is in a retirement facility in Connecticut. I am going to try to reach him tomorrow and see if I can conduct a telephone interview with him. He would be an amazing source of information into how AARS functioned. I am particular interested in trying to determine why the US Army failed to directly draw from the pool of trained AARS operators to fill the ranks of the Signal Corps after Pearl Harbor. Equally confusing is why the Army didn’t maintain the organization to continue to fulfill its domestic responsibilities of acting as an auxiliary communications network. Instead AARS disintegrated within hours after Pearl Harbor, but only to be replaced later by the Wartime Emergency Radio Service (WERS).
I am hoping tomorrow will be a productive research day.
Hoop-Dee-Doo and Disney Too!
We had a great time at Disney World! My hats off to the XYL for a ton of research and planning that went into the trip. One resource that really paid off was the PassPorter’s Walt Disney World 2009: The Unique Travel Guide, Planner, Organizer, Journal, and Keepsake! by Jennifer and Dave Marx. While I had a few other Disney books on my Kindle, the PassPorter was a veritable pirate’s treasure trove of advice and tips that did the most for making our trip and absolute, unqualified success.
We opted to take a direct flight for Kansas City to Orlando on Southwest. I don’t think it was the cheapest flight and Southwest has their quirky seating policy. However, with the kids (a 4 year old and a 8 month old) a direct flight was the best option. Fortunately, those traveling with small children get to board first, so even with Southwest’s cattle call seating we were able to keep the family intact.
Transportation from Orlando International to Disney World was via Disney’s own bus service. When staying at a Disney resort, this is a great service. Again, the XYL doing the research ahead time was able to get special tags for our checked luggage so we were able to bypass the baggage carousel and head straight for the Disney Express. Our baggage would then be retrieved by Disney and taken directly to our room at the resort.
The ride to our resort, Disney’s Animal Kingdom Lodge, was quick. The bus was equipped with overhead TVs playing an introduction video explaining check in at the resorts and other information. We arrived at the Animal Kingdom Lodge around 1pm and were able to quickly check in and head to our room. The room had two queen beds and overlooked the animal reserve that surrounded the resort. Giraffes, zebras, and other animals were grazing in the savanna like area a mere 50 yards away.
The XYL had also done some research on the meal plan that Disney offers. It is a bit complicated, but worth understanding. With a little bit of planning, opting for the meal plan can save quite a bit of money. We went down to the resort’s food court to grab a quick lunch and make sure our meal plans were working correctly. Then it was off to the resort’s bus stops to head to the Magic Kingdom.
Disney World has a massive transportation system that is primarily made up of buses, but there are also water taxis and of course the monorail. From resorts, you can travel to any of the parks (Magic Kingdom, Epcot, Hollywood Studios, and Animal Kingdom). From each park, you can travel to any of the resorts. Things get tricky if you want to travel from one resort to another (like to go to one of their restaurants or just look around). It requires you to first go to a park and then catch another mode of transportation to that specific resort. Things become complicated towards nighttime when parks start closing as transportation usually only runs to the parks for only one hour after closing. There are several iPhone/iPod Touch apps that track park opening and closing times which we used several time to make sure we didn’t end up going to a park in order to catch a bus that was no longer running. Some resorts are right on the monorail which makes life a breeze to get to both the Magic Kingdom and Epcot. Despite the complexity of the transportation system, you rarely wait longer than 20 minutes and the bus drivers (boat drivers, etc.) are all extremely helpful to help you get where you want to go.
And with that point I need to stress that every Disney employee (or as Disney calls them: Cast Members) is extremely helpful. From the bus drivers, hotel clerks, maids, restaurant waiters, store clerks, park security, ticket takers, and the staff members in the park. They all have an excellent attitude and do their best to make sure you are happy. An this is really what makes Disney World a top notch vacation destination. What makes the difference for Disney is the quality of their employees. All are dedicated to making your experience the best it can possibly be.
During our stay we traveled to all the parks. I most enjoyed the Magic Kingdom. Hollywood Studios would probably be my next favorite – although we didn’t get to spend as much time there as we wanted. All the parks were quite busy during the pre-Christmas days. Going early or staying late helped avoid the crowds. Also one park a day will have an early opening or late closing just for resort guests – which really helps.
Disney has many excellent restaurants that can get quite fancy but are also kid friendly. We enjoyed several of the finer restaurants like the Artist’s Point at the Wilderness Lodge and the restaurant on the 15th floor of the Contemporary resort (the California Grill) were we were able to enjoy the Magic Kingdom’s firework show from the comfort of our window-view table. There are also dining events specifically geared to allow the kids meet the many Disney characters. Our 4 year old daughter loved these, as she was able to meet just about everyone from Mary Poppins to June from Little Einsteins. Her highlight was the princess breakfast at the Cinderella Castle. She got to meet Cinderella downstairs and then most of all the rest of the princesses during breakfast (Sleeping Beauty, Snow White, Jasmine, and Ariel). While costs can be steep, effective use of the meal plan can really make it affordable.
Disney also affords the opportunity for the kids (and sometimes the adults) to get made-up in a certain Disney theme. We first took advantage of this with the Pirate’s League where individuals are able to get made-up as pirates like you’d find on the Pirate’s of the Caribbean (my favorite ride). The four year old was made up to look like Captain Hook, to include the red coat, eye patch, and sword. She had a blast. The Disney folks involved in the process “stay in character” and act like they are recruiting you to become a pirate, give you a pirate name, educate you in pirate lore and vocabulary, and then outfit you with a bit of pirate treasure. Again, the Disney employees are amazing in this process and really help to create the illusion. Towards the end of our stay, the four year old went to the Bibbidi Bobbidi Boutique (aka from the Cinderella story) were Fairy Godmothers make-over girls into one of the many Disney princesses. My daughter chose Aurora (aka Sleeping Beauty) and got to spend the remainder of the day in her princess dress and crown.
The whole Disney experience was excellent. Although it was expensive at times, I always felt I was getting great value and with the XYL’s research we saved money were we could. What really helped out on the finance side was the incredible deal Disney offers to the military members. My park ticket was free for 5 days. In addition, I was able to buy my family members 5 day tickets for half the normal price. A big thank you to Disney for that!
Would I take the family back? An absolute YES! Perhaps when the eight month old is four, we’ll head back. Next time I’d like to stay a little longer and probably we will try to go in the off-season to take advantage of smaller crowds.
Did I use amateur radio? Yes – a little bit. There is an excellent 2M repeater that gave great coverage across the parks. When the XYL and I had to split up, we were easily able to use our HTs to keep in touch.
History of Army MARS – can you help?
Since July I have been attending the School of Advanced Military Studies (SAMS) here at Ft. Leavenworth, KS. SAMS is a 10 month course that “educates the future leaders of our Armed Forces, our Allies, and the Interagency at the graduate level to be agile and adaptive leaders who think critically at the strategic and operational levels to solve complex ambiguous problems”. The majority of our classes are focused on the study and application of the elements of national power, international relations, and operational design. The end result is a planner who spends a year on a division or corps staff helping to draft campaign plans for operations. One of the requirements for graduation is to write a monograph (like a master’s thesis) on a topic relevant to the military. I chose as a topic to write about the history of the Army’s Military Affiliate Radio System (MARS).
I’ve enjoyed researching the subject. Army MARS was officially constituted back in 1925 as the Army Amateur Radio System (AARS). I go a bit further back into history and trace the introduction of radio into Army use and then what circumstances brought about the requirements for the Army to want to organize something like the AARS.
Once organized, the AARS had a difficult start and then went through a fairly significant reorganization in 1929. There were a few reasons the Army wanted to establish the AARS. One was to extend the Army’s existing War Department Radio Net beyond the radio stations on Army installations to achieve a greater reach to all corners of the country. Knowing the limitations of wire (telephone and telegraph) communications during significant weather and natural disasters, the addition of AARS stations to the War Department Radio Net would help the local and Federal government better coordinate and respond to emergencies. The other major reason for the founding of AARS was to provide a pool of civilians trained in Army protocol for radio operations in case of a major conflict. The Army had learned from WWI that there was little time available to amass and train a significant force. Radio operators required specific skills which needed longer training. If a trained pool of operators was already in existence, it would make it that much easier to mobilize in case of general war.
AARS did serve as a benefit in providing communications during natural disasters. However, after the Pearl Harbor attack and the country began to mobilize, AARS literally evaporated. It was not used as a pool to draw from to bolster the Army’s Signal Corps. The organization basically ceased to exist until it was reconstituted as MARS some time after the conclusion of WWII. That is one area where I have been unable to find any definitive information as to why the Army chose not to draw from the AARS pool when they started full mobilization for WWII. And why was AARS abandoned and then another domestic organization (WERS – War Emergency Radio Service) stood up in its place? If you can help show me where I can find these answers, I’d greatly appreciate it.
ARRL and the amateur community had its own agenda in supporting AARS. Both before and after WWI, the amateurs (represented by ARRL) and the US government clashed over who should have privileges in the RF spectrum. The Navy was adamant about preventing the amateurs from retaining any RF privileges that might interfere with naval radio traffic. When the ARRL got the opportunity to affiliate with the US Army through AARS, they hoped it was an opportunity to help cement their hold over the amateur RF allocations by virtue of the proven service amateurs were providing the country.
It is an interesting topic and I am enjoying digging through old copies of QST as well a Army journals.
I’ve started writing and have my first 10 pages complete. I’ll post it here soon for comment.
If you have any specific knowledge of either AARS or MARS operation between 1925 and 1963, please let me know (scott dot hedberg at sign gmail dot com). I would enjoy getting some real history straight from a primary source.
W1AW
I’ve had QSOs with W1AW when they’ve been at the Dayton Hamfest as well as other locations around the country, but I had never logged the home station back in Connecticut. That is until I was on my way back from the National World War I Museum where we had an offsite class followed by a guided tour of the museum. I’d been to the museum twice before without a guide and it was great having a guide this time. Our seminar leader is a colonel in the German Army, one of our classmates is from the British Army, and our PhD for this block is from Australia – so it was great getting an international perspective to WWI. As Americans, we tend to be myopic about WWI, not realizing that we only entered at the very end of the war. While our contribution was critical, it was a small sacrifice compared to how Europe had suffered. The museum is excellent – half is devoted to the war before US entry and the other covering the American Expeditionary Force.
But I digress – yes… the QSO with W1AW. I was on my way back to Leavenworth from the museum in Kansas City and was tuning around 20M. Up pops W1AW, the guest op was Mark from southern California, with a booming signal. I got him on the second call and am now happily in the log.
I am looking forward to the arrival of my new QSL cards so I can send one out (along with the SASE) to get a QSL card from W1AW.
Combustible CW
I had a QSO the other day with a gentlemen who was using a Navy flame-proof key. I had heard of the flame-proof key and knew that it was a military straight key – but I never really thought about why it was called flame-proof. If you have a sending speed >50 wpm, do you need to worry about fire breaking out in the radio shack? Well… the real answer is a qualified yes. I found the answer while perusing the Western Historic RADIO MUSEUM’s web page.
Many of the military keys were used with transmitters that were cathode keyed and sometimes had significant voltage on the key itself. Also, other types of equipment may have voltage levels or current levels that could cause sparking when the key breaks contact. This could present a problem in areas where flammable fuel vapors might at times be present, such as airplanes, tanks or ships during or after an attack where fuel tanks or fuel lines may have been ruptured and leaking. The flame-proof key enclosed the contacts in a sealed chamber to prevent exposure of the possible sparking to any combustible vapors so it would be possible to radio for help. The J-5-A on the left is a Signal Corps key that was introduced in the thirties but was built for many years, in fact the one shown is from WWII – built by L.B. Brach Mfg. Co. The key in the center is a Navy flame-proof key, the CAQZ-26026 built by Brelco Co. The key on the right is a British “Bath Tub” flame-proof key that is made out of bakelite. The bale clamp holds the upper part of the key (which has all of the key parts) down into the tub. There are many other types of flame-proof keys but all accomplish the same thing, isolation of the key contacts to prevent exposure of possible sparking to a combustible vapor.
… I am curious if the military actually learned this the hard way, deciding to encase the contacts only after an explosion or fire had occurred.