The air strike that March day in 1967 was on the ferociously well-defended Thai Nguyen steel mill, north of Hanoi, North Vietnam. One of the attacking U.S. Air Force McDonnell F-4C Phantoms was hit twice by anti-aircraft fire, and gas was streaming from the fuselage. Pilot Earl Aman and weapons systems officer Bob Houghton no longer had enough fuel to return to safe territory. The airplane Bob Pardo and backseater Steve Wayne were flying wasn’t in much better shape: During the strike it also caught an anti-aircraft round and was leaking fuel, and the two weren’t even sure they could...