60 mm. Mortar M19. FM 23-85 81 mm. Mortar M1. FM 23-90 Chemical Mortar 4.2 inch. FM 23-92 Service on the Piece 90 mm AA Gun M2 Series. FM 44-27 105 mm. Howitzer M2A1 on Motor Carriage M7B1 and M7B2. FM 6-74 105 mm. Howitzer M2-Series Towed. FM 6-75 155 mm. Howitzer M1, Towed. FM 6-81 155 mm. Howitzer M1 on Motor Carriage M41. FM 6-82 Field Artillery. Service of the Piece 155 mm. Gun M1918. FM 6-85 155 mm. Gun M53 Self-Propelled and 8 Inch Howitzer M55 Self-Propelled. FM 6-93 Field Artillery. Service of the Piece 240 mm. Howitzer M1918. FM 6-95 280 mm. Gun T131 on Carriage T72. FM 6-96