90-mm M117 anti-aircraft gun

The U.S. 90-mm anti-aircraft gun was produced in the M117 and M118 models. Both guns were produced within a few years of each other and were then replaced in U.S. service by the HAWK surface-to-air missile (SAM) system from 1960.

The M117 was towed on a four-wheel carriage having a single axle with vertically folded outriggers. In the firing position, the gun mount was lowered, the wheels rolled forward and the outriggers opened and extended behind the gun. The M117 took seven...