Instruments : Fire-control instruments - mobile artillery - USA Voorschrift, Training Regulations, No. 310 Field artillery - USA Voorschrift, Training Regulations, No. 430 Corps of engineers / War Department : Combat regiment - The platoon and the company - USA Voorschrift, Training Regulations, No. 445-18 Corps of engineers / War Department : The railway battalion - USA Voorschrift, Training Regulations, No. 445-25 Dropped and pick-up airplane messages - USA Voorschrift, Training Regulations, No. 160-6 Signal communication for all arms and services - USA Voorschrift, Training Regulations, No. 160-5
