I was at Khe Sahn when the movie was distributed in RVN and didn't see it until much later. We had an outside "Drive-in Movie" set up for the Yards in Kontum. We used sheets for the screen and had to change them about once a week because of the bullet holes. The Yards loved to shoot up the bad guys in westerns. When I returned to FOB-2 I was told they had to change the sceen daily. The yards really got carried away helping the SF repel the hords in the wire.
BTW: "Combat" with Vic Morrow was the most popular TV series on AFVN-TV