I have only started to scratch on the Korean surface.
Remember, this was just 5 years after WW2 ended, so I guess the '45 versions of regular inf and heavy inf could be used as is.
Tanks, artillery etc is also WW2 stuff (Sherman, Chaffe, T34/85, 105mm, Priest, 122mm, M16 etc).
I have not attempted to create any (workable

) mod myself yet.
For this first 5-scenarios mini-campaign-test (set in autumn 1950) we would need:
US:
F51 Mustang. Maybe, it looks like this was just a 1947 re-designation of the P51
F4U Corsair w/Napalm (nasty stuff...) Adding some ground support stat?
Turkish faction/flags etc:
45' Inf + heavy inf
NKPA (North Korea) faction/flags etc:
45' Inf + heavy inf + eng
122mm M38 (Soviet)
76mm M27 (Soviet)
SMG inf (new, the Soviets need one as well)
45mm M37 (Soviet)
57mm ZIS-2 (Soviet)
Truck (Soviet)
T34/85 (Soviet)
China:
45' Inf + heavy inf + eng
SU-76 (Soviet)
76mm M27 (Soviet)
57mm ZIS-2 (Soviet)
75mm M8 how (new?)