A Vietnam vet who specializes in freeing POWs goes behind enemy lines on a rescue mission with a group of mercenaries. A Vietnam vet who specializes in freeing POWs goes behind enemy lines on a rescue mission with a group of mercenaries. A Vietnam vet who specializes in freeing POWs goes behind enemy lines on a rescue mission with a group of mercenaries. A Vietnam vet who specializes in freeing POWs goes behind enemy lines on a rescue mission with a group of mercenaries.