Laundries, laundry batallions, and laundry companies ; December 12, 1942 - USA Technical Manual, TM 10-350 Landing operations on hostile shores - USA Basic Field Manual, FM 31-5 (suppl.) Service of the piece 8-inch Howitzer M 1 - USA Field Artillery Field Manual, FM 6-91 Assault gun section and platoon - USA Armored Force Field Manual, FM 17-25