I suggest adding Türkiye as a nation because it has a large variety of domestically produced and modified NATO vehicles in it’s vehicle fleet it could also represent some other nations like:
Azerbaijan
Uzbekistan
Qatar
Pakistan
Turkmenistan
and etc.
Here are some possible examples for Türkiye’s Tech-tree:
Ground
Altay MBT
Leopard 2A4NG
M60T Sabra
Tulpar IFV
Kaplan MT
Kaplan-20
Pars Alpha
FNSS Pars 8×8
Arma 8×8
Korkut SPAAG
Hisar-A / Hisar-O
Cobra II
Aircraft
F-4E 2020 Terminator
F-16C Block 50+
F-16 ÖZGÜR
Hürjet
KAAN
TAI Hürkuş-C
F-104G
F-100D
Helicopters
T129 ATAK
T929 ATAK II
S-70 Black Hawk
Possible sub-tree vehicles:
Azerbaijan – Su-25ML Lachin, MiG-29, T-90S, T-72 Aslan
Pakistan – Al-Khalid, Al-Zarrar, JF-17 Thunder
Qatar – Leopard 2A7+, F-15QA
Turkmenistan – T-72B, MiG-29
Uzbekistan – T-72, Su-27