Service of the piece 105-mm Howitzer, M 2, truck-drawn - USA Field Artillery Field Manual, FM 6-75 Service of the piece 8-inch Howitzer M 1 - USA Field Artillery Field Manual, FM 6-91 Advanced map and aerial photograph reading - USA Basic Field Manual, FM 21-26 Assault gun section and platoon - USA Armored Force Field Manual, FM 17-25 Service of the piece : 155-mm gun M 1 - USA Field Artillery Field Manual, FM 6-90 Laundries, laundry batallions, and laundry companies ; December 12, 1942 - USA Technical Manual, TM 10-350 Field Artillery : Tactical Employment - USA Field Manual, FM 6-20 Field artillery : Gunnery - USA Field Manual, FM 6-40 List of training films, film strips and film bulletins - USA War Department Basic Field Manual, FM 21-7