Aviation in support of ground forces - USA Voorschrift, Basic Field Manual, 31-35 Air-ground operations - USA Voorschrift, Field Manual, 31-35 Service of the piece : Twin 40-mm gun motor carriage M19 - USA Voorschrift, Field Manual, 44-62 Employment of the amphibious support brigade - USA Voorschrift, Field Manual, 60-25 American soldier : Set No. 1 American soldier American soldier 37mm Gun, Antitank, M3 - USA Basic Field Manual, FM 23-70 Chemical Laboratory Company - USA Chemical Warfare Service Field Manual, FM 3-25 Browning machine gun, caliber .50, HB, M2 ground - USA Basic Field Manual, FM 23-60 Browning machine gun caliber .30, HB, M1919A4 (mounted in combat vehicles) - USA Basic Field Manual, FM 23-50 Browning machine gun, caliber .50 HB, M2 / War Department - USA Field Manual, FM 23-65
