Entries are listed below in alphanumeric order (1-to-Z). In late 1931 all arms and services were directed to adopt mechanization and motorization, and were permitted to conduct research and experiment as necessary. The M3's design was somewhat unusual as the main weapon, a larger caliber, low-velocity 75 mm gun, was mounted in an offset sponson within the hull, giving the gun a limited traverse. Gun weight is typically the product of caliber and muzzle velocity, so in the case of the XM551 they sacrificed the muzzle velocity, producing the low-velocity but relatively large-caliber 152 mm M81. Managing a fighting withdrawal, they ended up as artillery in the Pusan Perimeter; in August reinforcements from the US and the Commonwealth brought heavier tanks that could easily dispatch the T-34s. In November 1936, the U.S. Army's cavalry branch decided to modernize and needed a fully armored vehicle, capable of keeping up with the cavalry and of fulfilling regular combat duties.  "M4" can refer specifically to the initial sub-type with its Continental radial engine, or generically to the entire family of seven Sherman sub-types, depending on context. The use of HEAT rounds instead of conventional penetrating ammunition could address this, but HEAT rounds work better at larger calibers. The tank was reclassified as a medium tank in May 1946, and while it didn't have time to make any impact in the Second World War, it served with distinction in the Korean War alongside the M4A3E8 Sherman. Although an experimental 15-ton tank, the M1924, reached the mock-up stage, this and other attempts to satisfy the War Department and infantry specifications proved to be unsatisfactory. With the disappearance of the heavy tank from US forces came the full acceptance of the main battle tank in 1960 in the U.S. Army, and 1973 in the U.S. Marine Corps.. The new design was put into action beginning on August 31, 1940. The M24's light armor made it vulnerable to enemy tanks, anti-tank guns, and hand-held anti-tank weapons. The M24 Chaffee was intended to replace the aging and obsolete Light Tank M5 (Stuart), which was used in supplementary roles. WW2 section contains two splendid stories of the US and German ‘Heavy Armor’ — T29 Heavy Tank and Jagdtiger. Instead, that job was relegated to the aptly named tank destroyer class of vehicle. The next tank to be designed, the M2 Light Tank, was developed in 1935 by Rock Island Arsenal for the infantry branch of the U.S. Army. On the other hand, it was noisy, fuel-hungry and heavy enough to cause problems with air transport. , The campaign in Iraq saw very similar performance from the tank from the Persian Gulf war, with no Abrams crew member being lost to hostile fire during the invasion of Iraq, although several tank crew members were later killed by snipers and roadside bombs during the occupation that followed. About 6,000 upgraded M1A1 Abrams were produced and used a 120 mm smoothbore cannon, improved armor, and a CBRN protection system. However, by 1991 the USSR had collapsed and the Abrams had not been in any combat. The gun had problems with cracks developing near the breech after repeated firing. The combined arms team consisted of elements furnished by Infantry (including tanks), Cavalry, Field Artillery, the Air Corps, Engineer Corps, Ordnance Department, Chemical Warfare Service, and Medical Corps. The M4A3 was the first to be factory-produced with the horizontal volute spring suspension (HVSS) with wider tracks to distribute weight; the smooth ride of the HVSS with its experimental E8 designation led to the nickname "Easy Eight" . In May 1946, due to changing conceptions of the U.S. Army's tank needs, the M26 was reclassified as a medium tank. The M4 Sherman was used by many of America's allies and continued to see service long after World War II. The M1A3 Abrams is in the early design period with the U.S. The United States continued development of the MBT-70 until 1971 when the program was finally cancelled. The U.S. War Department considered that two types of tanks, the light and the medium, should fulfill all missions. The infantry were in agreement that a light tank, transportable by truck, best met their requirements. It was originally designed to break through German defenses of the Siegfried Line, and was later considered as a possible participant in the planned invasion of the Japanese mainland. A trend towards heavier tanks was unmistakable as the war proceeded. The M46 Patton became a completely upgraded and modernized version of the M26 Pershing and total of 1,168 M46 tanks, were manufactured between 1949 and 1951. By ShinePhantom CC BY-SA 3.0 Have You Heard of The Special Forces Ghost Car That Operated in Bosnia (with video), The Amazing Discovery Of A Luftwaffe FW190 In A Forest Clearing Outside St Petersburg, “Holy Grail” Was Discovered in 2015 with $17 Billion Cargo, You & 8 Friends Can Rent an Entire Castle in England for $59 a Night. HEAT rounds fired by the M81 could defeat any contemporary tank at shorter ranges, but its low velocity made it difficult to use at longer ranges, especially against moving targets. The features of the M2 series development, both good and bad, provided many lessons for U.S. tank designers that were later applied with great success in the M3 Lee, M4 Sherman and many other armored fighting vehicles. The initial upgrade was designated the M3 Light Tank, and it was given thicker armor, modified suspension and a 37 mm gun. The MBT-70 was developed by the United States and West Germany in the context of the Cold War, intended to counter the new generation of Warsaw Pact tanks developed by the Soviet Union. Its long-ranged 120 mm cannon was designed to hit enemy tanks at extreme distances, but it was never used in combat. The M26 Pershing Heavy Tank came into service in 1945 under the designation of M26 Heavy Tank with the name "Pershing" named after General John J. Pershing, who commanded the U.S. Army during World War One. The Army began to phase out the Sheridan in 1978, although at the time there was no real replacement. The M60A1 was also equipped with a stabilization system for the main gun. From the summer of 1942, when enough U.S. medium tanks had been received, the British usually kept Stuarts out of tank-to-tank combat. The medium tank was not to exceed 15 tons, so as to bring it within the weight capacity of railroad flatcars. The driver sat in the hull. Heavier M4s were eventually brought to overcome heavily entrenched positions, though the Stuart continued to serve in a combat capacity until the end of the war. The M60A3 main battle tanks of the US Army were deployed in Operation Desert Storm in 1991 during the Gulf Crisis. There was an M7 tank design based on the M4 Sherman, but was so heavy it had to be reclassified as a medium tank and was not mass produced, with only 13 made. The U.S. Army needed a good tank and coupled with Great Britain's demand for 3,650 medium tanks immediately, the Lee began production by late 1940. The M3 was well armed and armored for the period, but due to design flaws (high silhouette, archaic sponson mounting of the main gun, below average offroad performance) it was not satisfactory and was withdrawn from front line duty as soon as the M4 Sherman became available in large numbers — the British managed to use the M3 successfully against the Imperial Japanese Army in Burma until 1945.. The M1A2 was a further improvement, with a commander's independent thermal viewer and weapon station, position navigation equipment, digital data bus and a radio interface unit. When the M6 project failed, American armorers didn’t give up their mission to develop a heavy tank. The British ordered large numbers of a slightly modified M3, which they called the General Grant. In particular, the M2's sloped frontal hull armor (glacis plate) was extremely advanced for a 1939 design, and would become a permanent feature of U.S. tank design. The armor was thin enough that it could be penetrated even by heavy machine gun rounds as well as being highly vulnerable to mines. The T26E3 was the prototype for the M26 Pershing heavy tank. A total of 2,222 M26 Pershing tanks were produced, beginning in November 1944, only 20 of which saw combat in Europe during World War II. At last, Army Staff overruled ground commanders. It was roughly equal to the enemy T-34-85s and they could destroy each other at normal combat ranges. While the US Army deactivated its heavy armor units with the reception of the new M60 series main battle tanks in 1960, the remaining M103s stayed within the US Marine Corps inventory until they began receiving the M60 series MBT. In 1969, armored cavalry units began replacing their M48 Patton tanks. The M4 was the best known and most used American tank of World War II.  After the Tank Corps was abolished as a separate branch, and control of tanks handed to the infantry, the number of tank units was progressively reduced, and the vehicles mothballed or scrapped. Many bridges that are adequate for the American tank pose a knotty problem for the German tank. The Continental AV1790-3 was chosen which was capable of more than 800 hp compared to the previous engine in the M26 Pershing which was rated for only 500 hp, and was coupled with the cross-drive transmission Allison CD-850-1. In 1939, most tanks had maximum armor of 30 mm (1.2 in) or less, with guns with no larger caliber than 37–47 mm. The early CTL designs did not have turrets. The following month, in light of a report into British and French theories on tank operation, the American Expeditionary Forces' commander-in-chief, General John Pershing, decided that both light and heavy tanks were essential for the conduct of the war and should be acquired as soon as possible. A common field-modification was to mount a large steel shield, known as an "ACAV set" (Armored Cavalry Assault Vehicle), around the commander's 50-cal. Several experimental versions of the Sheridan mounting a new turret carrying a 105 mm gun were made, but the resulting recoil was too great. An upgrade of the M3, which was initially called M4 but later redesignated the M5, was developed with improved engines and produced in 1942. Aside from this venture in the war, it was mostly used for training. The Churchill tank, named after Britain's leader of the time, faced an … To allow U.S. Army cavalry units to be equipped with armored fighting vehicles, the tanks developed for the cavalry were designated "combat cars." . Some E8s were equipped with the M101 howitzer. This medium tank would have to mount a 75 mm main gun armament into a fully-traversable turret. To cap it off, the tank could only be transported slung under a plane with its turret detached – hardly a practical option. The Walker Bulldog saw limited combat with the U.S. Army during the Korean Conflict, but for the most part, the conflict served as a testing ground to work out the tank's deficiencies, especially with its rangefinder. Most ended up being scrapped at war’s end.  As Chief of Staff from 1930 to 1935, Douglas MacArthur wanted to advance motorization and mechanization throughout the Army. The net effect of the infantry's preoccupation with light tanks, and the limited funds available for tank development in general, was to slow the development of heavier vehicles and, ultimately, to contribute to the serious shortage of medium tanks at the outbreak of World War II. As the Abrams entered service in the 1980s, they would operate alongside M60A3 Patton. When the American Army joined the North African Campaign in late 1942, Stuart units still formed a large part of its armor strength, until they were eventually replaced with M4 Shermans. The American version, the General Lee, joined its British cousin in North Africa in late 1942 during Operation Torch. The resulting M60 largely resembled the M48 it was based on, but has significant differences. The gas engines gave the tank a short operating range and were prone to catching fire when hit. In early 1951, the U.S. initiated the design of the M48 Patton, designated the T-48 with a 90 mm cannon. A total of 1,848 M1A1s were deployed to Saudi Arabia. It was needed in Korea and on 8 August 1950 the first M46 Pattons landed in South Korea. It used the twin Cadillac engines of the M5A1, as these had proved a very reliable option. The Sherman was a relatively inexpensive, easy to maintain and produce combat system. The tank was a large improvement over the M4. Some self-propelled artillery and self-propelled mortar vehicles were used in the direct fire role, but the M8 and the 105 mm howitzer-armed Shermans were the only vehicles dedicated for the use. Production for the M2 Medium Tanks was 18 M2 tanks, and 94 M2A1 tanks, for a total of 112. Some others took minor combat damage, with little effect on their operational readiness. The Panzer VII was named the “Löwe”, a 76-90 ton heavy tank, of which none were built. The Combat Car designation was dropped in 1940, and the vehicle was renamed as the light tank M1A2.. A small turret with a lighter, high-velocity 37 mm gun sat on the tall hull. The 75 mm gun used an M1 periscope, with an integral telescope, which was mounted on top of the sponson for sighting. Two arrived in France on November 20, nine days after the armistice with Germany, and a further eight in December.  The unit withdrew to the Bataan Peninsula as part of the general retreat, and ceased to exist on 9 April 1942 when the last surviving American and Philippine forces on the Bataan Peninsula surrendered. 51 Sheridans were deployed in the Gulf War as some of the first tanks sent. The U.S. has been greatly influential in the design philosophy, production and doctrine of tanks, and has been responsible for some of the most successful tank designs. Chrysler opened a new tank plant, the Detroit Arsenal Tank Plant, to manufacture the M2, and the US Government contracted in August 1940 for 1,000 vehicles to be produced. The Panzerkampfwagen VI Tiger tank was a German heavy tank that served on the Eastern Front, Western Front, and in North Africa during World War II. Despite vulnerability to rockets and mines, it was judged worth applying modifications and equip all cavalry squadrons with the Sheridan.. The M60A1/(A3 For Army) Patton continued in service with the Marines and saw action in the Gulf War. In 1957, plans were laid in the US for a tank with a 105 mm main gun and a redesigned hull offering better armor protection. A .30-06 M1919 Browning was then added to the upper hull bow plate. In the Korean War, M24s were the initial US tanks directed to combat the North Korean T-34-85s. The tank was produced in small numbers and never saw combat. Prohibited from developing tanks by the National Defense Act of 1920, it could not develop a "tank" in the conventional sense, so opted for a smaller and lighter "car" class vehicle.  Furthermore, the heavy M2 Browning machine gun it was equipped with was determined insufficient for the role. Two battalions, comprising the Provisional Tank Group fought in the Bataan peninsula campaign. Very few Abrams tanks were hit by enemy fire, and there was only one fatality, along with a handful of wounded as a result. The M2 Medium Tank was a larger development of the M2 Light Tank and was first produced in 1939 by the Rock Island Arsenal, just prior to the war in Europe. Several possible replacements for the M551 were tested as a part of the XM8 Armored Gun System and expeditionary tank efforts of the early and late 1980s respectively, but none of these entered service. For combat it was a poor design, with thin armor, inadequate main armament and a high-profile. Even though it’s called a Tank, the heavy armored self-propelled gun didn’t go along with the Tank name during this period. This narrows the heavy tank category to a very exclusive club of just three tanks: the The gun also has been criticized for having too much recoil for the vehicle weight, the second and even third road wheels coming clear off the ground when the main gun fired. Later models were given better armor. This article details the history of development of tanks produced by the United States, which it has done since their inception in World War One, up until the present day. The battalion shipped out on the night of March 26, however Eisenhower did not join them. The Shillelagh/M60A2 system was phased out from active units by 1981, and the turrets scrapped. By the mid-1990s, the M48s were phased out. The Sheridan's only air drop in combat occurred during Operation Just Cause in Panama in 1989, when fourteen M551's were deployed; four were transported by C-5 Galaxies and ten were dropped by air, but two Sheridans were destroyed upon landing. The first was the alpha male of heavy tanks (50 to 80 ton range). Tank Corps, and reassigned its tanks to the infantry branch, with only two heavy tank battalions and four light tank battalions escaping post-war demobilization.. In June–July 1944, the Army accepted a limited run of 254 M4A3E2 Jumbo Shermans, which had very thick armor, and the 75 mm gun in a new, heavier T23-style turret, in order to assault fortifications at Normandy Beach. Further combat was seen during 2003 in Iraq and Afghanistan. Before production on the M4 ramped up, however, the M4 design was further revised to include a heavy-barrel .50 BMG M2 Browning on the turret for anti-aircraft defense. The Chaffee reached Europe in 1944, in time to take part in the advance into Germany. Most field units were modified to help address the problem and the modified M81E1 was introduced with a shallower slot, along with a matching modification to the missile, that cured the problem.  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