USA

M3
M3A1
M5
M5A1
M24
M41
M4
M4A1
M4A2
M4A3
M4A4
M4A3E8
M4A3E2
M10
M10A1
M36
M36B1
M36B2
M18
M26
M46
M47
75mm M8
75mm M8A1
M4(105)
M4A3(105)
M4A3E9
M16 MGMC
M19 MGMC

Germany

Pz I A
Pz I B
Pz II C
Pz II E
Pz II L
Pz III F
Pz III G
Pz III J
Pz III L
Pz IV F2
Pz IV G
Pz IV H
Pz IV J
15
Pz VI
18
Pz VI B
Pz V D
Pz V A
Pz V G
Pz IV C
Pz IV D
Pz IV E
Pz IV F
Pz III N
PzJg I
Marder II
Marder III
Marder III H
Marder III M
StuG III F
StuG III G
StuG IV
Hetzer
Nashorn
JgPz IV
Pz IV/70
16
Ferdinand
17
Elefant
16
Jagdpanther
19
Jagdtiger
StuG III B
StuG III D
StuH 42
Flakpanzer 38(t)
Wirbelwind
Mobelwagen
Ostwind

Italy

L3/33
L3/35
L6/40
M11/39
M13/40
M14/41
M15/42
P40
M41M da 90/53
L40 da 47/32
M40 da 75/18
M42 da 75/34
M43 105/25

USSR

T-37
T-26
T-26s 1937
T-26s 1939
T-60 1941
T-60 1942
T-70 1942
T-70 1943
T-28
BT-2
BT-5
BT-7
T-34 1940
T-34 1941
T-34-57 1941
T-34 1942
T-34 1943
T-34/57 1943
T-34/85 1943
T-34/85 1944
T-44
KV-1 1939
KV-1E 1940
KV-1 1941
KV-1s
KV-85
IS-1
IS-2
IS-2m
20
IS-3
SU-76
SU-76M
SU-85
SU-122
SU-100
ISU-122
ISU-122S
KV-2
SU-152
ISU-152
M17 MGMC
T-90
ZSU-37

UK

Crusader mk I
Crusader mk II
Crusader mk III
Cromwell mk I
Cromwell mk IV
Challenger
Comet
Centurion
Matilda mk II
Matilda mk III
Matilda mk IV
Valentine mk II
Archer
Churchill mk I
Churchill mk IV
Churchill mk VII
Grant
3in SP Wolverine
17pdr SP Achilles
Sherman VC
Sherman VC 17pdr
Morris C9/B
Crusader AA mkI
Crusader AA mkII
These trees are purely speculative, not based on official information.
Layout and style mimics the current War Thunder tech tree, tank icons are from World of Tanks