Land mine warfare - USA Voorschrift, Field Manual 5-31 Enemy land mines and booby traps - USA Voorschrift,Technical Manual, 5-325 Searchlights : Description, operation, and care of mobile searchlight unit, cadillac chassis and power unit, and 60-inch open type - USA Voorschrift, Technical Regulations, 1180-5 machinist - USA Voorschrift, Technical Manual, 10-445 Corps of engineers / War Department : Communications - Military roads - USA Voorschrift, Training Regulations, No. 445-170 Corps of engineers / War Department : Combat regiment - The battalion and regiment - USA Voorschrift, Training Regulations, No. 445-19 Signal corps : Wire axis installation and maintenance within the division - USA Voorschrift, Training Regulations, No. 165-5 Air corps : Flying; general - USA Voorschrift, Army Regulations, No. 95-15 Air corps : Army railways communications system - USA Voorschrift, Army Regulations, No. 95-200 Air corps : Airdromes - USA Voorschrift, Army Regulations, 95-35 1/4-Ton 4x4 truck (Willys-Overland model MB and Ford model GPW) / War Department - USA Voorschrift, Technical Manual, 9-803 Signal Corps : Reports - USA Voorschrift, Army Regulations, No. 105-45