Service of the piece 37-mm fire unit - USA Voorschrift, Field Manual, 44-58 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 Amphibious operations battalion in assault landings - USA Voorschrift, Field Manual, 60-5 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
