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United States' M Number Designations

• M1A1 Combat Car:
• M2 Combat Car:
• M2 Light Tank:
• M2A1 Light Tank:
• M2A2 Light Tank:
• M2A3 Light Tank:
• M2A4 Light Tank:
• M2 Medium Tank:
• M2A1 Medium Tank:
• M3 Gun Motor Carriage: Developed from T17 Howitzer Motor Carriage.¹
• M3 Gun Motor Carriage Modified: Two quad .50 cal MG mounts.¹ Field modified in some Marine Corps units.¹
• M3 Light Tank:
• M3A1 Light Tank:
• M3A2 Light Tank:
• M3A3 Light Tank:
• M3 Medium Tank:
• M3A1 Medium Tank:
• M3A2 Medium Tank:
• M3A3 Medium Tank:
• M3A4 Medium Tank:
• M3A5 Medium Tank:
• M4 Gun Motor Carriage: Original name for M6.¹
• M4 Medium Tank:
• M4 (105 mm) Medium Tank:
• M4 (105 mm) HVSS Medium Tank:
• M4 Mortar Carriage: Developed from T19 Mortar Carriage.¹
• M4A1 Medium Tank:
• M4A1 (76 mm) Medium Tank:
• M4A1 Mortar Carriage: Modified M4 Mortar Carraige.¹
• M4A2 Medium Tank:
• M4A2 (76 mm) Medium Tank:
• M4A3 Medium Tank:
• M4A3 (76 mm) Medium Tank:
• M4A3 (76 mm) HVSS Medium Tank:
• M4A3 (105 mm) Medium Tank:
• M4A3 (105 mm) HVSS Medium Tank:
• M4A3E2 Medium Tank:
• M4A4 Medium Tank:
• M4A5 Medium Tank: Designation allocated for Canadian built Ram.
• M4A6 Medium Tank:
• M5 Gun Motor Carriage: Developed from T1 Gun Motor Carriage.¹
• M5 Light Tank:
• M5A1 Light Tank:
• M6 Gun Motor Carriage: Developed from T21 Gun Motor Carriage.¹
• M6 Heavy Tank:
• M7 Howitzer Motor Carriage: Developed from T32 Howitzer Motor Carriage.¹ Nicknamed "Priest."¹
• M7 Howitzer Motor Carriage Modified: Side armor was hinged.¹ This was prototype of M7B1 Howitzer Motor Carriage.¹
• M7B1 Howitzer Motor Carriage: On M4 Medium Tank chassis.¹
• M7B2 Howitzer Motor Carriage: Modified M7B1.¹ Had higher pulpit.¹
• M8 Howitzer Motor Carriage: Developed from T17E1 Howitzer Motor Carriage.¹
• M8 Howitzer Motor Carriage Modified: 75 mm M3 tank gun.¹
• M9 Gun Motor Carriage: Developed from T40 Gun Motor Carriage.¹
• M10 Gun Motor Carriage: Developed from T35E1 Gun Motor Carriage.¹
• M10A1 Gun Motor Carriage: M10 Gun Motor Carriage with Ford engine.¹
• M10 Gun Motor Carriage Modified: M10 Gun Motor Carriage with turret covered and cupola.¹
• M10 Gun Motor Carriage Modified: 90 mm gun.¹
• M12 Gun Motor Carriage: Developed from T6 Gun Motor Carriage.¹
• M13 Multiple Gun Motor Carriage: Developed from T1E4 Multiple Gun Motor Carriage.¹
• M14 Multiple Gun Motor Carriage: Developed from T1E4 Multiple Gun Motor Carriage.¹
• M15 Multiple Gun Motor Carriage: Developed from T28 Multiple Gun Motor Carriage.¹
• M15A1 Multiple Gun Motor Carriage: Developed from T28E1 Multiple Gun Motor Carriage.¹
• M16 Multiple Gun Motor Carriage: Developed from T58 Multiple Gun Motor Carriage.¹
• M16A1 Multiple Gun Motor Carriage: Shields added.¹
• M16A2 Multiple Gun Motor Carriage: Fire control modified.¹
• M17 Rocket Projector Tank: Developed from T40 Rocket Projector.¹
• M18 Gun Motor Carriage: Developed from T70 Gun Motor Carriage.¹ Nicknamed "Hellcat."¹
• M18 Gun Motor Carriage: 75 mm M3 tank gun.¹
• M18 Gun Motor Carriage With Floats: False bow and stern added to M18 Gun Motor Carriage.¹
• M18 Gun Motor Carriage Modified: Six fold up sides to cover turret and cupola.¹
• M18 Gun Motor Carriage with M36 90 mm Turret:
• M19 Multiple Gun Motor Carriage: Developed from T65E1 Multiple Gun Motor Carriage.¹
• M19A1 Multiple Gun Motor Carriage: Developed from T65E2 Multiple Gun Motor Carriage.¹
• M19 Motor Carriage Modified: Armed with 75 mm recoilless rifles.¹
• M21 Mortar Carriage: 81 mm mortar on M3 Halftrack.¹
• M22 Light Tank:
• M24 Light Tank:
• M26 Heavy Tank:
• M26E1 Heavy Tank:
• M29C Type A: Center mounted 75 mm recoilless rifle on Weasel.¹
• M29C Type B: Rear mounted 75 mm recoilless rifle on Weasel.¹
• M29C Type C: Center mounted 37 mm gun on Weasel.¹
• M30 Cargo Carrier:
• M31 Tank Recovery Vehicle: Based on M3 Medium Tank.
• M32 Tank Recovery Vehicle: Based on M4 Medium Tank.
• M32B1 Tank Recovery Vehicle: Based on M4A1 Medium Tank.
• M32B2 Tank Recovery Vehicle: Based on M4A2 Medium Tank.
• M32B3 Tank Recovery Vehicle: Based on M4A3 Medium Tank.
• M32B4 Tank Recovery Vehicle: Based on M4A4 Medium Tank.
• M33 Full-Track Prime Mover: Based on M3 Medium Tank.
• M34 Full-Track Prime Mover: Based on M4 Medium Tank.
• M35 Full-Track Prime Mover: Based on M10A1 Gun Motor Carriage.
• M36 Gun Motor Carriage: Developed from T71E1 Gun Motor Carriage.¹
• M36B1 Gun Motor Carriage: M36 turret on M4A3 Medium Tank.¹
• M36B2 Gun Motor Carriage: M36 turret with sloped turret cover.¹
• M37 Howitzer Motor Carriage: Developed from T76 Howitzer Motor Carriage.¹
• M37 Motor Carriage Modified: Developed from T96 Motor Carriage Modified.¹
• M38 Armored Car Modified: M24 Light Tank turret on M38 Armored Car.¹
• M39 Armored Utility Vehicle: Based on M18 Gun Motor Carriage.
• M40 Gun Motor Carriage: Developed from T83 Gun Motor Carriage.¹ Nicknamed "Long Tom."¹
• M40 Gun Motor Carriage Modified: Had square box cab added.¹
• M41 Howitzer Motor Carriage: Developed from T64E1 Howitzer Motor Carriage.¹ Nicknamed "Gorilla."¹
• M41 Mortar Carriage: Developed from T64E1 Mortar Carrier.¹
• M43 Howitzer Motor Carriage: 8" Howitzer on M4A3 Medium Tank chassis.¹
• M45 Medium Tank: 105 mm howitzer on T26E2 Medium Tank.¹

Sources:

1. Profile: AFV Weapons 26: Hellcat, Long Tom and Priest and Complete Check List of all U.S. World War II Self-Propelled Weapons, Colonel Robert J. Icks, 1971