- A2C2 - See AACC [US]
- A1E1 - Vickers Independant tank, Vickers Armstrong 1926 [UK]
- A2E1 - Medium Tank Mk 1 Vickers Armstrong 1924 [UK]
- A2E2 - Medium Tank Mk 1CS, Vickers Armstrong 1924 [UK]
- A3E1
3 Man Tank, ROF 1926 [UK]
Carrier MG No 1 1926 [UK]
- A4 - Vickers/Carden Lloyd light tanks [UK]
- A5 - Vickers/Carden Lloyd light tanks, 1930+ [UK]
- A6 - Medium Mark III tank aka 16 tonner, 1933 [UK]
- A6E1 - Medium Mk III tank prototype, 1928 [UK]
- A6E2 - Medium Mk III tank prototype, 1928 [UK]
- A6E3 - Medium Mk III tank prototype, 1928 [UK]
- A7E1 - Heavy Cruiser tank prototype aka 14 tonner, 1931 [UK]
- A7E2 - Heavy Cruiser tank prototype, 1931 [UK]
- A7E3 - Heavy Cruiser tank prototype, 1936 [UK]
- A7V - Series of heavy tanks [IG]
- A8 - Aborted medium tank project, 1934-37 [UK]
- A8E1 - Aborted medium tank project, 1934-37 [UK]
- A9 - Cruiser Tank Mk I, 1936 [UK]
- A10 - Cruiser Tank Mk II, 1937
- A11 - Infantry Tank Mk I aka Matilda, 1936 [UK]
- A11E1 - Infantry Tank Mk 1 aka Matilda, 1936 [UK]
- A12 - Infantry Tank Mk II aka Matilda, 1938 [UK]
- A12E1 - Infantry Tank Mk II aka Matilda, 1938 [UK]
- A13 - Cruiser Tank Mk III, 1937 [UK]
- A13 Mk II - Cruiser Tank Mk IV, 1938 [UK]
- A13 Mk III - Cruiser Tank Mk V aka Covenantor, 1940 [UK]
- A14E1 - Modified heavy cruiser tank project, 1939 [UK]
- A14E2 - Modified heavy cruiser tank project, 1939 [UK]
- A15 - Cruiser Tank Mk VI aka Crusader, 1940 [UK]
- A16E1 - Cancelled heavy cruiser tank project, 1939 [UK]
- A17E1 - Light Tank Mk VII aka Tetrach, 1938 [UK]
- A18 - Cancelled light cruiser tank project based on A17E1, 1939 [UK]
- A19 - Cancelled cruiser tank project with auxiliary turrets on top of main turret, 1939 [UK]
- A20 - Uparmoured Matilda tank project aka Shelled Area Infantry Tank [UK]
- A21 - Projected development of the A20 Shelled Area Infantry Tank [UK]
- A22 - Infantry Tank Mk IV aka Churchill, Vauxhall Motor Company [UK]
- A22E1 - Infantry Tank Mk IV aka Churchill, Vauxhall Motor Company [UK]
- A22F - Prototype for Churchill VII, redesignated A42 in 1945, Vauxhall Motor Company [UK]
- A23 - Projected lighter version of A22 [UK]
- A24 - Cruiser Tank Mk VII aka Cavalier, 1941 [UK]
- A25 - Light Tank Mk VIII aka Harry Hopkins, 1941 [UK]
- A26 - Lighter and faster A22 project [UK]
- A27L - Centaur cruiser tank [UK]
- A27M - Cruiser Tank Mk VIII aka Cromwell [UK]
- A28 - Cromwell tank with increased armour and skirting plates [UK[
- A29 - 17pdr armed cruiser tank project [UK]
- A30 - Challenger/Avenger tank [UK]
- A31 - Projected Cromwell tank with heavier armour [UK]
- A32 - Projected Cromwell with armour to Churchill standard [UK]
- A33 - Excelsior heavy assault tank [UK]
- A34 - Comet cruiser tank [UK]
- A35 - Heavier Cromwell tank project [UK]
- A36 - A30 project with thicker armour and armed with 17pdr [UK]
- A37 - A33 project with thicker armour and armed with 17pdr [UK]
- A38
Valiant I infantry tank [UK]
Valaint II infantry tank [UK]
- A39 - Tortoise heavy assault gun [UK]
- A40 - Projected heavier version of A30 [UK]
- A41 - Centurion tank [UK]
- A42 - Redesignated A22F, 1945 [UK]
- A43 - Black Prince infantry tank [UK]
- A44 - Comet project to increase armour and mount 17pgr gun [UK]
- A45 - Universal tank chassis based on Centurion [UK]
- A46 - Projected 17.5t tank armed with 77mm gun [UK]
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