Advanced map and aerial photograph reading - USA Basic Field Manual, FM 21-26 field manual Browning machine gun caliber .30, HB, M1919A4 (mounted in combat vehicles) / prep. under dir. of the Chief of Infantry field manual Browning machine gun, caliber .30, M1917 field manual 81-MM mortar, MI / Prepared under direction of the chief of infantry field manual Barrage balloon : operation of matériel and employment of personnel field manual Watermanship field manual 81-MM mortar squad and platoon field manual 75-mm tank gun M 2 : (mounted in medium tank M 3) Examination for gunners - USA Antiaircraft Artillery Field Manual, FM 4-119 Antiaircraft artillery : operation of matériel and employment of personnel, antiaircraft searchlight units - USA Coast Artillery Field Manual, FM 4-115 Service of the piece : 105-MM howitzer self-propelled - USA Armored Force Field Manual, FM 17-63 field manual Field wire technique