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United States' T Number Designations

  • T1 Multiple Gun Motor Carriage: Dual .30 cal MG on Dodge 1/2 ton 4x4.
  • T1 Gun Motor Carriage: Bofors 40 mm on Mack T3 Halftrack.
  • T1 Gun Motor Carriage: 3" AA gun on Cletrac MG-2 Tractor. Standardized as M5.
    United States' T1 Gun Motor Carriage
    US Ordnance Dept
  • T1E1 Mine Exploder: Based on M4 Medium Tank.
  • T1E1 Multiple Gun Motor Carriage: Bendis dual .50 cal turret on M2 Halftrack.
  • T1E2 Mine Exploder: Based on M4 Medium Tank.
  • T1E2 Multiple Gun Motor Carriage: Maxson dual (later quad) .50 cal turret on M2 Halftrack.
  • T1E3 Mine Exploder: Based on M4 Medium Tank.
  • T1E3 Multiple Gun Motor Carriage: Electrodynamic dual .50 cal turret on M2 Halftrack.
  • T1E4 Mine Exploder: Based on M4 Medium Tank.
  • T1E4 Multiple Gun Motor Carriage: Quad .50 cal turret on M3 Halftrack. Standardized as M13. On M5 Halftrack standardized as M14.
  • T1E5 Mine Exploder: Based on M4 Medium Tank.
  • T1E6 Mine Exploder: Based on M4 Medium Tank.
  • T2 Heavy Tractor:
  • T2 Mine Exploder Flail: Based on M4 Medium Tank.
  • T2 Gun Motor Carriage: Forward firing 37 mm gun on jeep.
  • T2E1 Gun Motor Carriage: Rearward firing 37 mm gun on jeep.
  • T2E1 Mine Exploder: Based on M4 Medium Tank.
  • T2E2 Mine Excavator: Based on M4 Medium Tank.
  • T3 Howitzer Motor Carriage: 75 mm howitzer on M1 Combat Car. Prototype for T17.
  • T3 Mine Exploder: Based on M4 Medium Tank.
  • T3E1 Mine Exploder: Based on M4 Medium Tank.
  • T3E2 Mine Exploder: Based on M4 Medium Tank.
  • T4: Pre-war designation for any mortar carried on a track laying vehicle.
  • T4 Mine Excavator: Based on M4 Medium Tank.
  • T4 Mine Exploder: Based on M4 Medium Tank.
  • T5: Pre-war designation for any mortar carried on a wheeled vehicle.
  • T5 Mine Excavator: Based on M4 Medium Tank.
  • T5E3 Mine Excavator: Based on M4 Medium Tank.
  • T6 Gun Motor Carriage: 155 mm on M3 Medium Tank chassis. Standardized as M12.
  • T6 Mine Excavator: Based on M4 Medium Tank.
  • T6E1 Multiple Gun Motor Carriage: Dual Bofors on M24 Light Tank chassis.
  • T7 Gun Motor Carriage: 3" gun on trackless tank. Project only.
  • T7 Light Tank:
  • T7 Mine Exploder: Based on M4 Medium Tank.
  • T7E2 Light Tank:
  • T8 Gun Motor Carriage: Forward firing 37 mm gun on Ford Swamp Buggy.
  • T8 Mine Exploder: Based on M4 Medium Tank.
  • T8E1 Reconnaissance Vehicle: Dual .30 cal MGs mounted on M3 Light Tank.
  • T9 Howitzer Motor Carriage: 105 mm howitzer on Cletrac MG-5 Tractor. Project only.
  • T9 Mine Exploder: Based on M4 Medium Tank.
  • T9E1 Light Tank: Became M22.
  • T9E2 Mortar Carriage: 81 mm mortar on T9 Light Tank chassis. Project cancelled.
  • T9E3 Mortar Carriage: 81 mm mortar on T9 Light Tank chassis. Used wider tracks. Project cancelled.
  • T10 Amphibian Light Tank: Had 37 mm gun, 18 mm armor, and weighed 12.5 tons.
  • T10 Mine Exploder: Based on M4 Medium Tank.
  • T10 Multiple Gun Motor Carriage: Dual Oerlikon on M2 Halftrack.
  • T10E1 Multiple Gun Motor Carriage: Dual Oerlikon on M3 Halftrack.
  • T11: Not used. Pre-war T11 Armored Car was still in service.
  • T11 Mine Exploder: Based on M4 Medium Tank.
  • T12 Gun Motor Carriage: French 75 mm gun on M3 Halftrack. Later shield added. Standardized as M3.
  • T12 Mine Exploder: Based on M4 Medium Tank.
  • T13 Gun Motor Carriage: Forward firing 37 mm gun on 6 x 6 jeep.
  • T13 Light Tank: Allis-Chalmers design. Similar to T16 with a 20 mm Hispano-Suiza.
  • T14 Assault Tank:
  • T14 Gun Motor Carriage: Rearward firing 37 mm gun on 6 x 6 jeep.
  • T14 Light Tank: Had turret on right with .30 cal Browning MG and a .30 cal MG for antiaircraft fire.
  • T14 Mine Exploder: Based on M4 Medium Tank.
  • T15 Gun Motor Carriage: 3" gun on Ford 6 x 6 chassis. Project only.
  • T15 Mine Resistant Vehicle: Based on M4 Medium Tank.
  • T15E1 Mine Resistant Vehicle: Based on M4 Medium Tank.
  • T15E2 Mine Resistant Vehicle: Based on M4 Medium Tank.
  • T16 Gun Motor Carriage: 4.5" gun on chassis built from T7 and M3 Light Tank components.
  • T16 Halftrack With Roof: Armour roof with .50 cal MG in front and .30 cal MG in rear.
  • T16 Light Tank: Had turret on left with .30 cal Browning MG. .30 cal MG for antiaircraft fire.
  • T16E1 Gun Motor Carriage: Modified T16.
  • T17 Howitzer Motor Carriage: 75 mm howitzer on M5A1 Light Tank chassis. Project only.
  • T17E1 Howitzer Motor Carriage: 75 mm howitzer in cast and welded turret on M5A1 Light Tank chasses. Standardized as M8.
  • T17E2 Armored Car: With Fraser Nash AA turret on T17E1 Armored Car.
  • T18 Howitzer Motor Carriage: 75 mm howitzer in cast hull on M3 Light Tank chassis.
    United States' T18 Howitzer Motor Carriage
    US Ordnance Dept
  • T18 Light Tractor: M22 with no turret. Could carry the five member crew of a 105mm airborne howitzer that it towed. Only one converted and project cancelled in late 1943.
  • T19 Howitzer Motor Carriage: 105 mm howitzer on M3 Halftrack. Later with various types of shields.
  • T19 Mortar Carrier: 81 mm mortar on M2 Halftrack. Standardized as M4 Mortar Carrier.
  • T20 Gun Motor Carriage: 3" gun on M3 Light Tank chassis. Project only.
  • T21 Gun Motor Carriage: 37 mm gun on Dodge 3/4 Ton 4 x 4. Different types of shields. Standardized as M4. Later standardized as M6.
  • T21 Light Tank: Similar to T20 Medium Tank. Was to have 76 mm gun, 30 mm armor, and weigh 24 tons.
  • T21 Mortar Carrier: Rear firing 4.2" mortar on M3 Halftrack.
  • T21E1 Mortar Carrier: Forward firing 4.2" mortar on M3 Halftrack.
  • T22 Cargo Carrier:
  • T22 Gun Motor Carriage: 37 mm gun on Ford 6 x 6 chassis. Name later changed to T22 Armored Car.
  • T22 Medium Tank:
  • T22E1 Gun Motor Carriage: 37 mm gun on Ford 6 x 6 chassis. Name later changed to T22E1 Armored Car.
  • T23 Gun Motor Carriage: 37 mm gun on Fargo 6 x 6 chassis. Name later changed to T23 Armored Car.
  • T23 Medium Tank:
  • T23E1 Gun Motor Carriage: 37 mm gun on Fargo 4 x 4 chassis. Name later changed to T23E1 Armored Car.
  • T24 Gun Motor Carriage: 3" gun on M3 Medium Tank chassis. Octagonal fighting compartment.
  • T25 Gun Motor Carriage: 105 mm AA gun in turret on M3 Medium Tank chassis.
  • T25 Medium Tank:
  • T26 Howitzer Motor Carriage: 75 mm howitzer on M3 Medium Tank chassis. Not built.
  • T26 Medium Tank:
  • T26E4 Heavy Tank: Modified M26 Heavy Tank.
  • T26E5 Heavy Tank: Modified M26 Heavy Tank.
  • T27 Gun Motor Carriage: Forward firing 75 mm gun on Studebaker Swamp Buggy.
    United States' T27 Gun Motor Carriage
    US Ordnance Dept
  • T27 Mortar Carrier: Forward firing 81 mm mortar on turretless M5A1 Light Tank.
    United States' T27 Mortar Carrier
    US Ordnance Dept
  • T27E1 Mortar Carrier: 81 mm mortar mounted on top of hull of M5A1 Light Tank. Project only.
  • T28 Heavy Tank:
  • T28 Multiple Gun Motor Carriage: 37 mm gun and two .50 cal MGs on M2 Halftrack. Shield added later. Standardized as M15.
  • T28E1 Multiple Gun Motor Carriage: 37 mm gun and two .50 cal MGs on M3 Halftrack. Three sided shield. Standardized as M15A1.
  • T29 Heavy Tank:
  • T29 Howitzer Motor Carriage: 75 mm howitzer on M3 Light Tank chassis. Project only.
  • T29 Mortar Carrier: 81 mm mortar on turretless M5A1 Light Tank.
  • T30 Cargo Carrier:
  • T30 Chemical Car: 7.2" multiple rocket launcher on turretless M8 Armored Car.
  • T30 Heavy Tank:
  • T30 Howitzer Motor Carriage: 75 mm howitzer on M3 Halftrack. Shield added later.
  • T31 Cargo Carrier:
  • T31 Demolition Tank: 7.2" rocket launder and two flamethrowers in large cast turret on M4 Medium Tank. Also designated the T94 Armored Engineer Vehicle.
  • T31 Multiple Gun Motor Carriage: Maxson quad .50 cal MG on M3 Halftrack. Project only.
  • T32 Heavy Tank:
  • T32 Howitzer Motor Carriage: 105 mm howitzer on M3 Medium Tank chassis. Pulpit added later. Standardized as M7.
  • T33 Gun Motor Carriage: Forward firing 37 mm gun on Ford Swamp Buggy.
  • T34 Heavy Tank:
  • T34 Howitzer Motor Carriage: 105 mm howitzer on Mack T3 Halftrack. Project cancelled.
  • T34 Rocket Projector on M4 Medium Tank: 4.6" 60 tube launcher mounted on top of turret. Nicknamed "Calliope."
  • T34E1 Rocket Projector on M4A1 Medium Tank: 4.6" 60 tube launcher mounted on top of turret.
  • T34E2 Rocket Projector on M4 Medium Tank: 4.6" 60 tube launcher mounted on top of turret. Launching tubes were square.
  • T35 Gun Motor Carriage: 3" gun on M4 Medium Tank chassis.
  • T35 Mortar Carrier: 4.2" mortar on T16 Armored Utility Car.
  • T35E1 Gun Motor Carriage: 3" gun on M4A2 Medium Tank chassis. Standardized as M10.
  • T36 Gun Motor Carriage: Bofors AA gun in cast turret on M3 Medium Tank chassis.
    United States' T36 Gun Motor Carriage
    US Ordnance Dept
  • T36 Mortar Carrier: 155 mm mortar on T16 Gun Motor Carriage.
  • T37 Multiple Gun Motor Carriage: Quad .50 cal MG in shield on M3 Halftrack.
  • T37E1 Multiple Gun Motor Carriage: Quad .50 cal MG mounted in parallel on M3 Halftrack.
  • T38 Howitzer Motor Carriage: Short 105 mm howitzer on M3 Halftrack.
  • T38 Mortar Carrier: 4.2" mortar on M37 Motor Carriage.
  • T39 Howitzer Motor Carriage: 105 mm howitzer on T13 Armored Car. Project cancelled.
  • T39 Rocket Projector on M4 Tank: 7.2" two tube launcher mounted above turret.
  • T40 Gun Motor Carriage: 3" AA gun on M3 Medium Tank chassis. Standardized as M9. Similar to T32.
  • T40 Rocket Projector: 7.2" 20 tube rocket launcher on turret. Standardized as M17.
  • T40 Rocket Projector (Short Type): Shorter rocket launcher.
  • T41 Howitzer Motor Carriage: 75 mm howitzer on M3 Light Tank chassis. Welded armor. Project only.
  • T42 Gun Motor Carriage: 37 mm gun on T9 Light Tank chassis. Project dropped. The project restarted with Bigley light vehicle. Project dropped.
  • T43 Gun Motor Carriage: 37 mm gun on Studebaker 6 x 4 chassis. Name changed to T21 Armored Car.
  • T44 Gun Motor Carriage: Rear firing 37 mm gun on Ford Swamp Buggy chassis. Gun later changed to 57 mm. Shield added later.
  • T45 Howitzer Motor Carriage: 105 mm howitzer on Mack track chassis. Project only.
  • T45 Rocket Projector on M24 Light Tank: Multiple rocket launcher.
  • T46 Gun Motor Carriage: Rear firing 75 mm on Studebaker Swamp Buggy chassis.
  • T47 Howitzer Motor Carriage: Short 105 mm howitzer on M5A1 Light Tank chassis.
  • T48 Gun Motor Carriage: 57 mm gun with shield on M3 Halftrack. Built for British.
  • T49 Gun Motor Carriage: 57 mm gun on fast chassis. Prototype for T67.
  • T50 Gun Motor Carriage: 3" gun on chassis. No prototype built.
  • T51 Gun Motor Carriage: British 25 pdr. on M3 Medium Tank chassis. Similar to Sexton.
  • T52 Multiple Gun Motor Carriage: Bofors and two .50 cal MGs on M4 Medium Tank chassis.
  • T53 Gun Motor Carriage: 90 mm AA gun mounted at the rear of a M4 Medium Tank chassis. Different shields tried.
  • T53E1 Gun Motor Carriage: 90 mm AA gun mounted in the center of a M4 Medium Tank chassis.
    United States' T53E1 Gun Motor Carriage
    US Ordnance Dept
  • T54 Gun Motor Carriage: Bofors gun on M3 Halftrack.
  • T54E1 Gun Motor Carriage: Bofors gun and two .50 cal MGs on M3 Halftrack. Shield was circular. Outriggers added.
  • T55 Gun Motor Carriage: 3" AA gun mounted on the front of a Allied Machinery Company 8 x 8 truck.
  • T55E1 Gun Motor Carriage: Redesigned T55.
    United States' T55E1 Gun Motor Carriage
    US Ordnance Dept
  • T56 Gun Motor Carriage: 3" AA gun on M3A3 Light Tank chassis. Had gun shield. Engine was larger.
  • T57 Gun Motor Carriage: 3" AA gun on M3A3 Light Tank chassis. No shield. Engine was larger.
  • T58 Multiple Gun Motor Carriage: Quad .50 cal MG on M3 Halftrack. Later became M16. On M5 Halftrack was called M17.
  • T59 Multiple Gun Motor Carriage: Dual Bofors on M3 Halftrack.
  • T59E1 Gun Motor Carriage: Single Bofors on M3 Halftrack.
  • T59E1 Gun Motor Carriage: Same with outriggers.
  • T60 Multiple Gun Motor Carriage: Bofors and two .50 cal MGs. New designation for T54E1.
  • T60E1 Multiple Gun Motor Carriage: Bofors and two .50 cal MGs. Different shield than T60.
  • T61 Multiple Gun Motor Carriage: Quad .50 cal MGs on M2 Halftrack.
  • T62 Rocket Motor Carriage: 4.5" rocket projector with shield on armored Dodge 3/4 Ton 4 x 4.
  • T63 Multiple Rocket Projector Carriage: Only design, not built. Replaced by T75.
  • T64 Howitzer Motor Carriage: 155 mm howitzer on longer M5 Light Tank chassis.
  • T64 Mortar Carrier: 4.2" mortar on M24 Light Tank chassis.
  • T64E1 Howitzer Motor Carriage: 155 mm howitzer on M24 Light Tank chassis. Standardized as M41.
  • T64E1 Mortar Carrier: Modified T64 Mortar Carrier. Standardized as M41 Mortar Carrier.
  • T65 Multiple Gun Motor Carriage: Twin Bofors on longer M5A1 Light Tank chassis.
  • T65E1 Multiple Gun Motor Carriage: Twin Bofors on M24 Light Tank chassis. Standardized as M19.
  • T65E2 Multiple Gun Motor Carriage: Twin Bofors on M24 Light Tank chassis. Standardized as M19A1.
  • T66 Gun Motor Carriage: 75 mm gun on T19E1 Armored Car.
  • T67 Gun Motor Carriage: 75 mm gun on high speed chassis.
  • T68 Multiple Gun Motor Carriage: Twin Bofors (one placed above other) on M3 Halftrack.
  • T69 Multiple Gun Motor Carriage: Quad .50 cal MG on M8 Armored Car chassis.
  • T69 Multiple Gun Motor Carriage: Had improved fire control.
  • T70 Gun Motor Carriage: 76 mm gun on modified T67 chassis. Standardized as M18.
  • T71 Gun Motor Carriage: 90 mm gun in larger turret on M10 chassis.
  • T71E1 Gun Motor Carriage: 90 mm gun in larger turret on M10A1 chassis. Standardized as M36.
  • T72 Gun Motor Carriage: 76 mm gun on M4 Medium Tank chassis. Initially used open turret but later used M4 turret.
  • T72 Rocket Projector on M4 Tank: 4.6" 60 tube rocket launcher mounted on M4 Medium Tank.
  • T73 Gun Motor Carriage: 75 mm M3 tank gun on M3 Gun Motor Carriage chassis.
  • T73 Rocket Projector on M4 Tank: 4.6" 10 tube rocket launcher mounted on M4 Medium Tank. Tubes were square.
  • T74: Not used.
  • T75 Multiple Rocket Motor Carriage: Two 10" and four 4.5" rocket projectors on 1 1/2 Ton 6 x 6.
  • T76 Howitzer Motor Carriage: 105 mm howitzer on modified M24 Light Tank chassis. Standardized as M37.
  • T76 Rocket Projector on M4 Tank: 7.5" rocket launcher replacing 75 mm gun in M4A1 Medium Tank.
  • T76E1 Rocket Projector on M4 Tank: 7.5" rocket launcher replacing 75 mm gun in M4A3E8 Medium Tank.
  • T77 Multiple Gun Motor Carriage: Quad .50 cal MGs in welded turret on M24 Light Tank chassis.
  • T77E1 Multiple Gun Motor Carriage: Quad .50 cal MGs in welded turret, with a plastic dome, on a M24 Light Tank chassis.
  • T78 Gun Motor Carriage: 90 mm gun on M24 Light Tank chassis. Project only.
  • T79 Gun Motor Carriage: 155 mm gun on light weight chassis using T23 Medium Tank power train. Project only.
  • T80 Howitzer Motor Carriage: 8" howitzer on light weight chassis using T23 Medium Tank power train. Project only.
  • T81 Mortar Carrier: 4.2" mortar on M5A1 Light Tank chassis.
  • T81 Multiple Gun Motor Carriage: Bofors and two .50 cal MGs on T65E1 chassis.
  • T82 Howitzer Motor Carriage: Short 105 mm howitzer on M5A1 Light Tank chassis. A smaller M7.
  • T83 Gun Motor Carriage: Rear mounted 155 mm gun ("Long Tom") on M4A3E8 Medium Tank chassis. Standardized as M40.
  • T83 Gun Motor Carriage: Rear mounted 155 mm gun ("Long Tom") on M4A3E8 Medium Tank chassis. Standardized as M43.
  • T84 Howitzer Motor Carriage: 8" howitzer on T26E1 Medium Tank chassis.
  • T85 Multiple Gun Motor Carriage: 20 mm Oerlikon quad gun mount at rear of M5 Light Tank chassis.
  • T85E1 Multiple Gun Motor Carriage: New gun mount for T85.
  • T86 Amphibious Gun Motor Carriage: 76 mm gun on altered M18. Propelled in water by tracks.
  • T86E1 Amphibious Gun Motor Carriage: 76 mm gun on altered M18. Propelled in water by two screws.
  • T86E1 Amphibious Gun Motor Carriage: 76 mm gun on altered M18. Propelled in water by one screw.
  • T87 Amphibious Howitzer Motor Carriage: 105 mm howitzer on altered M18. Smaller than T86.
  • T88 Howitzer Motor Carriage: 105 mm howitzer on M18.
  • T89 Howitzer Motor Carriage: 8" howitzer on M26 Heavy Tank chassis.
  • T90 Mortar Motor Carriage: 155 mm mortar on M4 Medium Tank chassis.
  • T91: Unknown. Classified secret.
  • T92 Howitzer Motor Carriage: 240 mm howitzer mounted in rear of M26 Heavy Tank chassis.
  • T93 Gun Motor Carriage: 8" gun mounted in rear of M26 Heavy Tank chassis.
  • T94 Mortar Motor Carriage: 10" mortar on M40 chassis. Mockup only.
  • T95 Gun Motor Carriage: 105 mm assault gun. Initially called T28 Heavy Tank.
    United States' T95 Gun Motor Carriage
    US Ordnance Dept
  • T96 Mortar Motor Carriage: 155 mm mortar on M37 chassis.
  • T99 Rocket Projector on M26 Tank: Two 11 tube launchers on sides of the turret.
  • T105 Rocket Projector on M4A1 Medium Tank: Long 7.2" launcher replacing 75 mm gun in M4A1 Medium Tank.

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
  2. Profile AFV Weapons #46 Light Tanks M22 Locust and M24 Chaffee, Colonel Robert J. Icks, 1972
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