MIL-T-45331F, MILITARY SPECIFICATION TRUCK, UTILITY: 1/4 TON, 4X4, M151A2, TRUCK, AMBULANCE: FRONT LINE, 1/4 TON, 4X4 M18A1, TRUCK, UTILITY. 1/4 TON, 4X4 CARRIER FOR 106MM RIFLE M825 (19 JAN 1976)., This specification covers three tactical-type trucks for use by the Armed Forces; one utility truck, one front line ambulance, and one weapon carrier.