It’s the 1980s and the British Army Of the Rhine is still stationed in West Germany facing down the USSR’s forces. The Cold War has gotten hot and the 3rd Shock Army is approaching your dugout but how do you differentiate a BTR from a BMP? This handy British Army THREAT Recognition Guide booklet gives you everything you need to know about the Soviet armour, infantry and aircraft you’re facing!
Continuing on from our earlier look at a British Army threat Recognition Guide to Iraqi Ground Forces issued during the Gulf War, we dig into the TAB reference collection again and take a look at this Threat Recognition Guide looking at Soviet air and ground forces facing the British Army of the Rhine in the 1980s.
The Group of Soviet Forces in Germany (GSFG) in East Germany throughout the Cold War were an ever present threat to West Germany and NATO. This recognition guide covers all of the USSR’s main battle tanks, armoured personnel carriers, and infantry fighting vehicles, as well as artillery systems and some of the close support aircraft which would have accompanied the attacking Soviet forces.
The pages of the recognition guide include photographs, diagrams, basic specs and recognisable features of the various enemy vehicles. It was put together by the Intelligence Directorate of BAOR’s 1 Corps.
The US entered the Great War with no tanks of their own – by the end of the war they had designed and built their first tank, collaborated on a leviathan heavy tank with Britain and built their own copy of the French FT. In this video we look at how the US Army hit the ground running and formed two tank corps and built their first tanks.
In recent videos we’ve looked at all of the US Army’s early tanks, here’s a round up:
The tinny 3-ton Ford was the first American designed and built tank. Aiming to use readily available parts and materials it took inspiration from the French Renault FT but was smaller and lacked the FT’s revolutionary turret. The Ford was only lightly armoured and did have the best cross country handling. Check out our full article on the Ford here.
The MkVIII was a truly ‘international’ effort with the US, UK and France all working on the project. The US and UK provided the mechanical components while France provided a factory to assemble the formidable vehicles. The MkVIII wasn’t ready in time to see action during the war but remained in US service into the 1930s. Check out our full article on the MkVIII here.
The US also sought to produce their own licensed version of the French Renault FT, making some slight changes the tank was adopted as the M1917 but despite production being well underway by late 1918, none of the M1917s reached the front. Instead they became the backbone of the US Army’s interwar tank force. One even climbed a mountain!Check out our full article on the M1917 here.
This is the last of our series of videos/articles on the US Tanks of WWI, you can find all episodes here.
The MkVIII Heavy Tank holds the distinction of being the result of the first successful international co-operative tank project. Developed with input from British and American designers and engineers, intended to be equipped with British weapons and an American engine, with parts made in the US and Britain and to be assembled in France – a truly international undertaking. The MkVIII, sometimes referred to as ‘The International’ or ‘Liberty Tank’, owed its basic design to earlier British heavy tanks but a number of important changes were made.
Intended for introduction in 1919, the war ended before the MkVIII could enter service and even before its French factory had been completed. It did, however, see some production and inter-war service providing the heavy tank backbone of the US’ tank force for many years.
The design evolved from work by British Lieutenant G.J Rackham with later input from American engineer Major Herbert Alden. The MkVIII heavy was very much an evolution of the earlier British rhomboid heavy tanks but Rackham and Alden made some important improvements. Chiefly the redesigning of the tank’s sponsons which housed a pair of British 6pdr guns. While the tank was a foot narrower than its predecessors, the new folding sponsons could enabled the tank to be transported more easily by rail and to also, in theory, navigate narrow spaces. Alden patented this feature in December 1918 (US #1366550). Additionally, the commander’s ‘outlook turret’ positioned on top of the tank’s turret, which had vision slits on all four sides, was also retractable. Alden’s sponsons were hinged at the front and mounted on rolling bearings so they could pivot inwards.
The MkVIII directly addressed several shortcomings of earlier British heavy tanks, firstly the engine was insulated in its own compartment to prevent exhaust fumes overwhelming the crew. A new ventilation system was also added with a fan keeping fumes out of the fighting compartment. Secondly, overall visibility was improved with protected vision and revolver slits and the addition of the tank’s commander’s turret.
Another important design change was the move to longer tracks, about 5 inches in length, which required a dozen less links than the MkV. Each of the links was shallowly stamped to increase its strength. In terms of armament the MkVIII was designed as solely ‘male’ – with guns in its sponsons, not machine guns – however, with a raised tower on the tanks roof this provided positions for five machine guns in hemispherical ball mounts. Two more machine guns could be mounted in the tank’s hull doors located behind the sponsons. The ammunition for the 6pdr guns was held in a central ammunition storage box but the sponsons also had shell storage space surrounding the guns themselves.
The 37 ton tank was to be powered by an American V12 aircraft petrol engine manufactured by the Liberty company. Although a cheaper, water-cooled Liberty was eventually used in the American tanks. The British developed a similar 12 cylinder engine from Ricardo. This, in theory, produced 300 horsepower with a top speed of just over 6mph and a range of just under 40 miles. The MkVIII’s engine was moved from the centre of the tank to a separate engine compartment at the rear of the tank. This not only reduced engine heat and fumes in the fighting compartment but also made communication easier. Some sources also suggest that the MkVIII was the first tank to have an electronic intercom system.
The American Preliminary Handbook for the MkVIII listed the tanks as being equipped with 7 ‘Hotchkiss .303-inch machine guns’, these are likely to be Hotchkiss Portative MkI*s popular in British service. In US service, however, the tanks were likely later equipped with the new Browning M1919 Tank Machine Guns. The tank carried 182 rounds of 6pdr ammunition and an additional 26 smoke rounds as well as 21,000 rounds of machine gun ammunition to keep the 7 machine guns fed.The tank’s armour was also increased lightly from the previous MkV, with 16mm of frontal armour and between 10 and 12mm at the sides. Less vulnerable areas had armour 6mm thick.
The American MkVIIIs were initially planned to be manned by an eleven-man crew made up of a driver, commander, two gunners and two loaders to man 6pdrs, four machine gunners and a mechanic. Later crew complements probably dispensed with two of the machine gunners as the US MkVIIIs operated during the inter-war period dispensed with two of the midships machine guns. The British crew was planned to be smaller with 8-men fighting the tank, made up of a driver, commander a pair of gunners and loaders for the main guns and two machine gunners who were tasked with manning the tank’s various machine guns. Impressively the 34 feet long tank also had room for as many as 22 infantry to be transported.
As an allied collaborative project the production of parts was to be a collaborative effort. Britain was to contribute armour plate, structural frame work and armament. The American contribution was to include the automotive parts including the engine, brakes, drive sprockets, gears and transmission.
The French were largely uninterested in British heavy tanks and their primary contribution to the MkVIII project was a factory site near the village of Neuvy-Pailloux, 165 miles south of Paris, in central France. Critically located well away from the fighting on a main rail route north, through Issoudun. Construction of the impressive factory appears to have begun in early 1918, with the framework of seven long production halls and the installation of a powerplant and generators and the building of railway sidings completed before the armistice in November 1918. Production barely got underway in Britain, let alone in France. Contemporary photographs taken in January 1919, by the US Army Signal Corps show the factory with its roof in various stages of completion, its shop floors unfinished and empty and open to the elements. The factory would eventually be completed and used by the French army as an artillery park and later a maintenance depot.
The oringal plan was for the tank parts to be shipped across the channel and the atlantic through France’s western coastal ports to be shipped by rail to Neuvy-Pailloux where they would be assembled into working tanks. It was envisaged that the workforce would be made up of Chinese labourers with British and American foremen and managers.
As many as 3,000 tanks were planned for 1919. The British intended to build 1,450 MkVIIIs of their own use in addition to the 1,550 to be produced for general allied use. The British tank parts were to be manufactured in Manchester, by the various workshops of the Manchester Tanks Association, and in Glasgow, by the North British Locomotive Company. Mass production in Manchester never got underway and the initial British MkVIIIs were built in Glasgow – just 24 are believed to have been built, all but six of these were scrapped almost immediately. The first American tanks were assembled by the Locomobile Company of Bridgeport, Connecticut. The American-assembled MkVIII completed acceptance trials in the spring of 1919. With the end of the war the US order was reduced from 1,500 to 100. 100 sets of hull components were bought from Britain and assembled with corresponding American parts at the Rock Island Arsenal.
The MkVIII was the last of the British rhomboid heavy tanks. The handful of British MkVIIIs built never entered service but the 100 American tanks along with American built M1917s, MkV Heavies and Renault FTs brought back from France, formed the backbone of the US Tank Corps throughout the early inter-war period. The US MkVIIIs remained in use as training tanks until 1932. Today, just three are believed to survive; two in the US and one in Britain.
In April 1919, a lone US-built M1917 light tank climbed over 11,000 feet up a mountain in Colorado. We are lucky enough to have some original photos and footage of the tank’s climb up Pikes Peak in the Rocky Mountains.
The tank with ‘Pikes Peak or Bust’ painted on its hull (US National Archive)
Why was a tank driving up a mountain?
Simply put the expedition was a publicity stunt to help raise cash to pay off America’s war debt. By 1919 the cost of US involvement in World War One had reached $32 billion – that’s around $547 billion today.
The purpose of the stunt was to encourage Americans to purchase ‘Victory Liberty’ War Bonds which would help pay off some of the debt accrued by the war. This was the fifth, and final, round of Liberty Bond sales. The drive began in mid-April 1919, and aimed to sell $4.5 billion of government bonds.
The tank arrived in Colorado Springs at the beginning of April and on the 14th a crowd of nearly 1,000 people watched Mrs W.H.R. Stote, the chairwoman of Colorado Springs’ Victory Liberty loan committee, christened the tank ‘Little Zeb’ – after explorer Brigadier Zebulon Pike – who led an expedition that attempted to climb the mountain in 1806)
Mrs Stote reportedly declared “I charge you with making the trip to the summit. As the Victory Loan shall not fail, you must make it to the top!” The tank’s commander Sgt. A.H. Worrell, told The Colorado Springs Gazette that he had “driven tanks over trees and trenches on the western front and I am betting we get to the top.”
The road up to the summit of Pikes Peak, photographed in 1934 (US National Archive)
At the time the 19 mile road up to Pikes Peak was said to be the ‘World’s Highest Motor Drive’ with the summit at 14,115 feet (or 4,302m). Cpl. Howard Brewer, the tank’s driver told reporters “I know we can climb it. Given time, the tank could go to the top of the world.” In terms of publicity having the tank make it up the mountain would certainly have been quite a feat.
On the front of the tank’s hull the words ‘Pike’s Peak or bust’ were painted in white – this is a reference to a phrase coined by prospector’s during the Pike’s Peak Gold Rush of the 1860s.
The tank on the road up Pikes Peak (Pikes Peak District Library)
The tank was driven by Corporal Howard Brewer and tended by a crew of mechanics and support vehicles. The road which climbed the mountain was unsurfaced and had only been completed in 1916. The tank’s ascent began on April 15, and incredibly over the next two days the tank climbed to 11,440 feet, 13 miles along the road and through several deep snow drifts, reportedly up to 20-feet tall, before a track plate snapped. After repairs the tank and support convoy pressed on – but the tank never made it to the summit. Not because of mechanical failure but unbelievably because it was needed to appear in other Colorado towns as part of the Victory Loan drive.
While the tank may not have reached the very top of the mountain, it unsurprisingly became a record breaker – setting the first elevation record for tanks. Western Union claimed that it also set a distance record for continuous distance travelled and penetrated the farthest into the snow than any other vehicle had ever done at that time of year – battling snow drifts up to 20 feet tall. While the US-built M1917 was never tested in battle the drive up the mountain proved it was a capable, hardy vehicle – demonstrating the tank’s abilities.
Various photos and contemporary footage taken from the US National Archives (source)
Additional photos held by the The Manitou Springs Historical Society (source)
‘Army’s Tank Assault on Pikes Peak Was About More Than Being Macho’, The Gazette, M.L. Cavanaugh, (source)
U.S. Economy in World War I, Economic History Association, (source)
Continuing our series looking at US tanks of World War One, in which we have already taken a look at the Ford M1918 3-Ton Tank, in this video/article we will take a look at the M1917 Light Tank.
The US Army entered the Great War with no tanks or experience in armoured warfare. When the American Expeditionary Force’s Tank Corps was formed in early 1918, it was equipped with French and British tanks. With plans to rapidly expand the US Tank Corps with battalions training in the US, France and Britain, a large number of tanks would be needed. The corps trained with the French Renault FT light tank and the British MkV but with French production stretched to capacity they could not hope to provide the US with the tanks it was expected to need for operations during 1919.
As a result the US negotiated with France for a license to produce the FT in the US, commissioned a smaller 3-ton light tank from Ford and entered into an agreement with Britain to build a new heavy tank – the MkVIII. The American-made FTs were designated the Model 1917 6-ton light tank. 4,400 were ordered, with deliveries to begin in April 1918. The Ordnance Department finalised the M1917s design and contracted a number of private companies to build the tanks.
Delays in production, however, meant that the first American tanks were completed in October 1918, and none of the M1917s reached the Western Front before the war ended. As a result, the primary US tank of the war was the original French Renault FT, revolutionary for its turret which could rotate 360-degrees and its rear-mounted engine. It was cheaper to manufacture than the heavier British tanks and could be transported by lorries behind the lines. The FT equipped the 1st Provisional Tank Brigade, what would become the 304th Tank Brigade, commanded by Lt. Colonel George S. Patton. The American FT’s saw action for the in September 1918, at the Battle of St. Mihiel.
144 US FT’s took part in the battle and both the tanks and crews performed well. The Five of Hearts, a 37mm-armed FT with the 344th Tank Battalion took part in the Meuse-Argonne offensive and while making an isolated attack on German positions in support of bogged down US Infantry, the tank was immobilised and its gun mantle jammed by enemy small arms fire. The tank’s commander Sergeant Arthur Snyder recalled:
“My wounded driver kept filling pistol clips and I produced as much fire as possible with our pistols and the crippled 37mm. I paid more attention to the volume of fire than its accuracy for I fear the enemy would close in if the volume diminished. Three machine guns were set up at very close range, but just out of range of our piece with its limited elevation. The fragmentation of our shells did afford some protection but I could not train this fire on the German field piece. The constant hammering of these machine guns at close range was terrific. The hinges on the doors could not stand up under it for long, but it was the mushroom ventilator on top of the turret that gave way. I was hit in the back of my head with fragments of it and bullet splinters.”
Luckily for Snyder the German infantry made no attempt to rush the tank, content to pepper it from a distance, and they quickly retreated when infantry from the 16th Infantry arrived.
In terms of protection Snyder felt that “the armor plate on those old French Renaults was good, but when you came to close quarters the splinters from bullets hitting around the vision slits did considerable damage.” Two of Snyder’s drivers were badly wounded one by bullet splash splinters and the other in the throat.
The M1917 was manufactured by the Van Dorn Iron Works, the Maxwell Motor Co., and the C.L. Best Co. Of the original wartime order for over 4,000 tanks, in total just 952 M1917s were produced. 375 of these are believed to have been equipped with 37mm M1916 cannons, while 526 armed with Marlin M1917 tank machine guns. The remaining 50 were outfitted as unarmed signal tanks.
The M1917 has a number of small differences from the FT. Its exhaust is located on left rather than right side of the tank. A new US-designed gun mount and mantlet was used. Solid steel idler wheels at the front of the tank rather than the spoked type used by the French. Additional vision slits for the driver were added and a bulkhead sectioned off the engine from the cab. Like their French cousins the M1917 was manned by a two-man crew, the driver and the commander who also acted as loader and gunner.
A different, American-made, engine – a water-cooled 4 cylinder engine built by the Buda Engine company was used. Developing 42 horsepower, it had more torque than its French counterpart but was no faster, with a top speed of between just 6 – 8 miles per hour. The tank weighed just over 7 US tons and was 16.5 feet long and 7ft 7” tall. Its armour was 0.25″ to 0.6″ (6.35mm to 15.25mm) thick – slightly thinner than its French counterpart. The majority of the tanks were armed with machine guns, using the .30 calibre M1917 Marlin tank machine gun, rather than the French Hotchkiss. The ‘male’ or cannon armed tanks had a 37mm gun and carried more than 230 shells for the gun. The Marlin was later supplanted by the early iteration of the M1919 Browning tank machine gun. 50 command and signals tanks were also built, these unarmed tanks were similar to the French TSF (télégraphie sans fil) and fitted with a wireless radio.
Perhaps the M1917s most impressive feat stemmed from a publicity stunt in April 1919, when a M1917 climbed Pikes Peak, a mountain in Colorado. At the time the road up Pikes Peak was said to be the ‘World’s Highest Motor Drive’, a single tank was driven up the mountain as part of fund raising efforts for the fifth, and final, round of Liberty Bond sales, which hoped to raise $4.5 billion from the sale of government bonds. We’ll have a separate looking at this exploit at a later date!
None of the M1917s reached the frontline but many were used a props for selling war bonds – in this photo dated April 1918, a platoon of M1917s is seen after they arrived at Camp Meritt by train, they are about to be painted up in camouflage for a Victory Loan parade in New York.
After the war the M1917, along with just over 200 French-made FTs brought back from France, formed the backbone of the US Tank Corps. In these photos we can see several tanks taking part in a mock-battle with supporting infantry at Camp Meade in May 1919. This photo show men learning to service their vehicles at Camp Meade, in December 1919.
But by 1921, the Corps had lost its independence and been all but disbanded with the Infantry given control of America’s tank force. A handful of the M1917s were deployed briefly overseas with the USMC, during the 1920s, but the M1917 was resigned to training as it became increasingly obsolete. They were finally removed from service in the mid-1930s. When World War Two broke out the remaining M1917s were sold to Canada and were reportedly used to help train the Royal Canadian Armoured Corps before many of them were finally scrapped.
Footage courtesy of the US National Archives (source)
Camp Colt to Desert Storm: The History of U.S. Armored Forces, G.F. Hofmann & D.A. Starry (1999) Tanks: 100 Years of Evolution, R. Ogorkiewicz (2015)
Light Tank M1917, Tank Encylopedia, C. Moore, (source)
The Saga of the Five of Hearts, Armor, July-Aug. 1988, Maj. Gen. W.R. Kraft Jr. (source)
While I was doing some research in the US National Archives’ catalogue, for footage of the Ford M1918 Light Tank, I came across this snippet of film. As we saw in our earlier video on the M1918 the tank struggled to deal with some terrain. In this video we see that at one point the prototype 3-ton tank managed to flip over completely! Which begs the question, how many men does it take to flip a tank?
….The answer appears to be around 20! The tank was relatively light, weighing in at 3 tons, but I still don’t think think I would have been one of them men pulling the tank’s track towards them!
When the US entered World War One in April 1917, the US Army had no experience with tanks. American observers in France had reported on the early Allied uses of tanks at the Somme and American enthusiasm for the new machines was lacking in many of the Army’s upper echelons.
This began to change after the arrival of General Pershing and his staff in France, ahead of the American Expeditionary Force. Pershing directed that a Tank Corps be raised and detailed a number of officers, including the enterprising young officer, Captain George S. Patton, to establish a training ground and report on how best to deploy tanks.
Patton was instrumental in shaping the US Army’s early tank doctrine, he wrote a highly detailed report on how to deploy tanks to maximum effect. Patton, a cavalry officer by training, admired the French Renault FT’s speed, mobility and manoeuvrability but felt the two doctrines of French light and British Heavy tanks could be combined. In December 1917, Colonel Samuel Rockenbach was placed in command of the new, but still tank-less, US Tank Corps.
Britain and France shared their tank designs with the US but in early 1918, the American automobile giant, Ford, began work on an American light tank. The result was a light and mobile tank weighing in at 3 US tons (or 2.7 metric tons). Sometimes referred to as the Ford 3-Ton Tank or the Ford Model 1918. Ford hoped to produce the new tank using as many off the shelf components, from their automobile and truck production, as they could. So the new tank was powered by two 4-cylinder Ford Model T engines, in theory developing around 40 horsepower, with a maximum speed of 8 mph and an operational range of just over 30 miles. Taking cues from the French FT, the M1918’s engines, fuel tank and transmission were mounted in a compartment at the rear of the tank. Some sources note that the tank was developed with the assistance of the Van Dorn Iron Works, in Cleveland, Ohio, presumably assisting in the manufacture of bullet-proof steel plates making up the tank’s armour.
Contemporary photographs show the prototype during assembly in one of Ford’s Detroit workshops. We’re extremely lucky to have these photos showing the development process, they show that the initial shape and layout changed very little but some important changes were made as the tank was tested. The photographs date to April 1918, suggesting that by late spring the first prototype was assembled.
Like the French FT, the M1918 had a two-man crew but was significantly lighter weighing 4 tons less. The Ford could reach speeds of up to 8 mph while the slower FT could achieve around 5 mph. The Ford M1918 was 14 feet (or 4.3m) long, making it slightly shorter than the FT. The Ford’s armour was much thinner than its French counterpart, while this helped with weight, it would have left the crew vulnerable. It had just 7 to 13mm of armour compared to the FT’s 8 to 22mm. The tank’s tracks were also extremely narrow, and while the tank was light, this could have conceivably led to issues with getting bogged down in thick mud. Some of the contemporary footage of the prototype shows it with wider, more practical looking, tracks but the later pre-production models seem to have reverted to the narrower tracks.
The earlier prototype Ford tank did not have a gun fitted and the front doors for both driver and gunner were hinged at the sides, rather than at the top. Some of the contemporary footage shows the gun-less prototype becoming trapped nose-up, at an almost 90-degree angle, after trying to cross a relatively narrow trench. To prevent this we see that the later tanks were subsequently fitted with a ‘trench tail’.
In terms of armament, the Ford was also limited with a single .30 calibre machine gun, mounted on the right side of the hull in an armoured casement. The casement doesn’t appear to have a prominent sight aperture or vision slit for the driver so how the gun was aimed is unclear. The gun also appears to have a very limited firing arc compared to the FT’s turret mounted gun, which could rotate a full 360 degrees. It is unclear exactly what sort of gun was going to be mounted in the tank although an Hotchkiss M1909 Benét–Mercié (also used in British tanks) may have been an option. Another more likely option would have been the specially-developed M1919 air-cooled Browning Machine Gun, which had been specially developed for tank mounting. Judging from the size of the armoured housing for the gun, however, it may have been intended to mount the M1918 Marlin Tank Machine Gun, which had large aluminium cooling fins.
The Ford had a two-man crew with the driver on the left and a gunner on the right. The driver also had a cupola, with vision slits, on the roof of the tank which allowed him to drive when the hatch was closed. But this must have been difficult to see out of unless the driver changed his driving position.
The tank had an exposed front axle connecting its large front track idlers, this would have been susceptible to damage from enemy fire and from hitting obstacles. At the rear is the drive sprocket and along the body of the tank are two sets of three suspension wheels with two track support rollers above. Note that the support rollers are mounted on a truck leaf spring, another example of off-the-shelf parts being utilised. This represents a change from the single support roller seen in the earlier prototype
The later footage shows as many as half a dozen pre-production tanks on the move during a demonstration at Ford’s plant in Detroit. We get a good feel for how fast and manoeuvrable the Ford tanks were. But they also struggle to navigate some of the more difficult terrain and don’t appear to have the power or traction to tackle some of the steeper hills or ditches. The tanks much have been difficult to steer, likely using a pair of clutch levers to control the tracks on either side. Two tanks even collide with each other and there’s a couple of other near misses as the Ford’s navigate around the test area. One tank becomes stuck requiring two others to pull it clear of the bank.
The War Department was eager to get tanks into production ordering 15,000 M1918s from Ford, with 500 to be delivered in January 1919 with production continuing at 100 per day after that. An initial batch of 15 were ordered for testing. At least one of these was sent to France for evaluation before the end of the war. The French were unimpressed finding it inferior to the FT, they did consider it as an artillery tractor for the French 75. The US also considered the Ford for this role and some photograph captions from early 1919, of Battery A, 140th Field Artillery, describes it as a ‘3-ton tractor’ for pulling “the new American 75mm split trail gun”, the M1916. These photographs also prove that more than one M1918 reached France.
The Ford tanks were not well regarded by those with practical experience, with the men of the US Tank Corps in France not consulted about the tank before it was ordered by the Ordnance Department. The war ended before large scale production of the M1918 could begin, With just 15 M1918s built we’re lucky to have this much film of it in action. Today only two of the Ford light tanks survive in US Army collections.
In reality the M1918 was more a Machine Gun Carrier than a tank. How effective it might have been is a matter of speculation. It’s difficult to say, while the French may not have felt it was an improvement over the FT, it certainly showed enough merit for the War Department to make a large order. Its narrow tracks, lack of protection and minimal armament may have proved to be problems. The M1918’s real legacy is that it while the US had built other tanks during the war, including the M1917, a copy of the FT, and the MKVIII heavy tank, in collaboration with the British, the M1918 Ford was the first truly American designed and built tank.
The Illustrated Encyclopaedia of Military Vehicles, I.V. Hogg & J. Weeks (1980) The Complete Guide to Tanks & Armoured Fighting Vehicles, G. Forty & J. Livesey, (2012) Camp Colt to Desert Storm: The History of U.S. Armored Forces, G.F. Hofmann & D.A. Starry (1999) The Machine Gun: History, Evolution, and Development of Manual, Automatic, and Airborne Repeating Weapons, G.M Chinn (1951)