Staff Manual Field Artillery : Tactical Employment - USA Field Manual, FM 6-20 Dispatch drafting manual Field artillery : Gunnery - USA Field Manual, FM 6-40 Materiel instruction memorandum : The Firing Battery 105mm Howitzer M2 Gunnery instruction memorandum : The Graphical Firing Table (GFT) Materiel instruction memorandum : Preparation of Vehicles for Deep Water Fording Gunnery instruction memorandum : Conduct of Fire by Forward Observation Methods Gunnery instruction memorandum : Use of Oblique Photographs in Firing Gunnery instruction memorandum : Time Fire Using Shell Fuzed With Fuze M54 of M55 Gunnery instruction memorandum : Technique of Fire Direction Gunnery instruction memorandum : 12-inch graphical firing tables