Corps of engineers / War Department : Combat regiment - The platoon and the company - USA Voorschrift, Training Regulations, No. 445-18 Heavy weapons company infantry regiment / Department of the Army - USA Field Manual, FM 7-15 Cannon Company, Intanfry Regiment. - USA Voorschrift Field Manual 7-37 Corps of engineers / War Department : Combat regiment - The battalion and regiment - USA Voorschrift, Training Regulations, No. 445-19 Armored cavalry regiment and the armored cavalry reconnaissance battalion - USA Voorschrift, Field Manual, 17-95