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 Adjustment of Artillery Fire by the Combat Soldier. FM 6-135 Field Artillery Battery. FM 6-140 Rifle Company. Infantry and Airborne Division Battle Groups. FM 7-10 Armored Infantry Company and Battalion. FM 7-17 Combat Support Company Infantry Division Battle Group. FM 7-19 Infantry Battalion. FM 7-20