Killer Instinct (1987)

 

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(aka) Behind Enemy Lines. Robert Patrick (Copland, The Marine) is Johnny Ransom, head honcho of a squad of jungle fighters who are ambushed by the enemy at the close of the Vietnam war. Ransom escapes but rather than taking the freedom bird home decides to head back into the bush to exact revenge on the Soviet adviser responsible for the death of several of his men, and to rescue what's left of his squad from Charlie. His superiors are more than happy to send him and a few men on his quest, but only as long as they rescue a communist defector being held by the Soviet officer and the NVA.

The Vietnam war rages on! This time Mr. Santiago puts our heroes on POW rescue mission. Everything seems be going just fine, but our heroes find themselves ambushed by the Vietkongs and are taken as prisoners.