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To aid the escape of American presidential adviser Chet Davis, who is imprisoned by the Chinese in Cambodia, Major Thomas seeks help from his brother Link and his four motorcyclist friends--Duke, Dirty Denny, Speed, and Limpy. Two of them have other reasons for going to Vietnam: Denny to visit his old whorehouse and Duke to resume his affair with the lovely Suriya. Their motorcycles are converted into armored vehicles, and the five men prepare to leave on their mission. Duke and Suriya are ambushed and shot by Viet Cong, however, and the remaining four men enter Cambodia to find the Chinese camp. Davis, who is actually on a secret mission for the CIA, resists his rescuers and is finally forcibly taken away by Link. All the motorcyclists are killed in the getaway, and Davis returns to U. S. headquarters alone.