On April 2nd 1972, a U.S. Airforce EB 66 escorted a squadron of B 52 bombers over the demilitarized zone between North and South Vietnam. The unarmed electronic warfare plane, call sign “Bat 21?, carried a crew of six. Their mission was to seek out enemy missile batteries before they could strike the bombers. In the midst of an enemy invasion the airmen are shot down. They land as 30,000 North Vietnamese troops descend upon South Vietnam. Rescue attempts by air end in tragedy. But one Navy Seal refuses to leave three Americans behind enemy lines.