Browning Machine Gun Caliber.30 inch, HB. M1919A4. Mounted in Combat Vehicles. FM 23-50 - USA Basic Field Manual, FM 23-50 Combat Intelligence. FM 30-5 Combat Intelligence, FM 30-5 Combat Intelligence, FM 30-5 Aggressor Order of Battle. FM 30-103 Aggressor Order of Battle. FM 30-103 Engineer Combat Battalion Divisional. FM 5-132 Engineer Battalion Armored Mechanized and Infantry. FM 5-135 Engineer Battalion Armored, Infantry and Infantry (Mechanized) Divisions. FM 5-135 Nondivisional Engineer Combat Units. FM 5-142 Mortar Battery Airborne Division Battle Group. FM 6-18 The Field Artillery Observation Battalion and Batteries. FM 6-120