The film begins with a tough Greek lieutenant (J. Carrol Naish) announcing that the United States Marine Corps is seeking volunteers for a hazardous mission and special unit. Sgt. Transport Anderof (Sam Levene) meets the commander of the unit, Lt. Col. Thorwald (Randolph Scott), who he has served with while stationed in China. Thorwald explains that he left the Corps to serve with the Chinese guerrillas fighting the Japanese during the Second Sino-Japanese War to learn their methods and has decided to form a unit using the qualitiesof Gung Ho or work together. Among the volunteers for the unit are a hillbilly (Rod Cameron), who responds to a gunnery sergeant's (Walter Sande) question whether he can kill someone with the fact that he already has; specifically a romantic rival. Alan Curtis is an ordained minister keeping his vocation a secret. Robert Mitchum is Pig Iron; a boxer from a background of poverty and hard work. Harold Landon is a young and small street kid who is initially rejected by Naish but wins him over, as both worked as dishwashers on ships bound to the United States from Piraeus, Greece. Noah Beery Jr. and David Bruce are rivals for United States

nurse Lt. Grace McDonald. Volunteers with brief screen time include. What's in the box 1 x DVD