Mortar carrier T-21 circles the field at Aberdeen proving ground. It moves over rough and level terrain. Soldiers open rear door revealing mortar. Soldier climbs into the carrier and inspects grenades and other equipment. (Note: The 4.2" M2 heavy mortar recoil was hard on the halftrack chassis so the T-21 was cancelled and never adopted.) (World War II period).
U.S. 30-caliber machine guns fired in Aberdeen Proving Ground, Maryland. Four 30-caliber machine guns on multiple mount with gun. The Vikers Data Computer directs the firing. The gun crew fires the machine guns.
U.S. 37mm automatic anti-aircraft gun fired in Aberdeen Proving Ground, Maryland. The 37mm automatic anti-aircraft mobile mount in a traveling position. The anti-aircraft gun is manned by the gun crew. An officer loads shells. The gun is fired.
U.S. height finders used in World War I. The Barr and Stroud anti-aircraft height finder used in Aberdeen Proving Ground, Maryland. Members of the crew use the height finders. The crew uses the Bausch and Lomb 8-foot height finder.
A 3-inch anti-aircraft gun fired at a target in Aberdeen Proving Ground, Maryland. The 3-inch anti-aircraft gun equipped with torque amplifiers for distant control is operated by Ordnance Data Computer T 1. A battery of four 3-inch anti-aircraft guns. The gun crew fires guns at the towed target. Shells burst around the target range at a range of 8500 feet. The target falls after a hit.
A 3-inch anti-aircraft gun T1 fired in Aberdeen Proving Ground, Maryland. The 3-inch mobile anti-aircraft gun T1 with a muzzle velocity of 2600 feet per second in a traveling position. The gun is emplaced by the members of the crew. A river can be seen in the background. The gun is fired at a towered target by the gun crew. The target is brought down from a height of 9000 feet. Members of the crew pose.
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