Ordnance provision system. [Ordnance catalog (ordnance provision system): Group A. Gun, automatic, 37-mm, M1A2 and carriage, automatic gun, 37-mm, M3, M3A1, and M3E1, major items, maintenance parts and equipment required for maintenance of gun, automatic, 37-mm, M1A2 and carriage, automatic gun, 37-mm, M3, M3A1, or M3E1, addendum; Jan. 7, 1943.