2220hrs, December 27, 1972: Captain Pham Tuan took off from Yen Bai Air Base, Hanoi to intercept incoming USAF Boeing B-52 Stratofortress bombers. Dodging MiGCAP F-4s, Tuan climbed to 20,000 feet. As Tuan raced to his IP, GCI kept him informed of the B-52 formation’s position and warned him of the escorting F-4s following the