A south Vietnam soldier comes to America to kill the ex marines of his own group. Due to a misunderstanding in the war. But one of the marines stands in his way.
I might be totally wrong with this guess Does this Vietnam vet pretends to be incapable of walking and use a wheelchair?
I remember watching a review about a movie called “kill squad.” Vietnam vet kills the soldiers who was with him, and only one of 4/5 soldiers make it out alive at the end of the movie.