Ordnance provision system. [Ordnance catalog (ordnance provision system)]: Group A, Gun, machine, cal. .30, Browning, M1917 and M1917A1, and mount, tripod, machine gun, cal. .30, M1917A1, major items, maintenance parts and equipment required for maintenance of gun, machine, cal. .30, Browning, M1917A1 and mount, tripod, machine gun, cal. .30, M1917A1, addendum; Nov. 25, 1942.