Shot in Atlanta (GA) at the same time as Chuck Norris' Invasion U.S.A. (1985). Several of the exterior locations were shared, as were some of the stunt men. They would work on "The Annihilators" during the day and then go over and work on "Invasion USA" at night.
The "Vietnam" sequences were shot first, near Charlie Brown airport in Atlanta, GA. During the scene in which our heroes are on patrol and fooling around setting off "booby traps", Gerrit Graham ("Ray Track") was actually injured. His character trips a "melee monster"--a log with bamboo spikes. It is suspended by a rope and swings down the trail to impale the victim. Graham's character sees the trap, places a canteen on his head, trips the trap and the spiked log impales his canteen into a tree. This stunt worked in the "long shot" with the canteen on the stunt man's head. For the close-up, however, Graham stepped in, placed a plastic canteen on his head and they pulled the spiked log just out of frame then gave it a mighty shove. The canteen was plastic instead of metal; when the log struck it, instead of going through it the spike bounced downward into Graham's forehead!. He was sent off for microsurgery (to help prevent scarring) and a re-write took place. He returned to the set in the final week of production to shoot his remaining (reduced) scenes. The unfortunate impalement was filmed close up, in full 35mm color but apparently, that roll was "accidentally destroyed" and never printed.