The 90mm M1A2 is an American heavy anti-aircraft gun developed in 1938. It was the standard U.S. anti-aircraft gun throughout World War II and the Korean War. Canadians used it with the M33 fire control system, which included the two trailers surrounding this gun.
The carriage could operate remotely, allowing the M242 (located to the right) and the M243 (located to the left) to control the gun’s aiming. The artillery system allowed Gunners to concentrate on setting fuses and loading the ammunition.
Immediately after World War II, the Canadian Army adopted the gun for heavy anti-aircraft defence against potential Soviet bombers. Canada retired the guns in 1960 when surface-to-air missiles became the primary anti-aircraft weapon.
Weight of Projectile: 23.4 pounds (10.6 kilograms)
Range: 39,500 feet (10,308 metres)
Detachment: 3 fire control trailers, generator trailer, 4 towing vehicles, light truck and 10 Gunners