Graham: Your 1 friend is using a tan .45 holster. Should be black as far as I know.
otherwise, what Porkchop said
The Keiichione:
Your uniform is early woodland. NOT ERDL.
Chicom: OK.
AK: Use type 56 or 47. No vert grips or (romanian) wire stocks. No polymer/bakelite mags. Steel only.
M56 gear: Looks OK from what I see.
ALICE Ruck: Did not exist in the 'Nam. Lightweight ruck, CIDG, or ARVN ruck.
You have a general idea but still a-ways to go