He did, also co-directed. IIRC, it was the only major movie made (1968) about NAM during NAM.
From Wikipedia:
“George Takei missed working on the “The Trouble With Tribbles” and “The Gamesters of Triskelion” episodes of the original “Star Trek” series to work on this movie.”
M*A*S*H (1970) took place during the Korean War.
Too bad, a tribble would be a fashionable pet for a ghey man, he could carry it around in his purse like a little dog.