In the air war, four F-4C Phantom jets escorting a formation of U.S. bombers on a raid over munitions manufacturing facilities at Kang Chi, 55 miles northwest of Hanoi, are fired at from an unknown launching site. It was the first time the enemy had launched antiaircraft missiles at U.S. aircraft.
One plane was destroyed and the other three damaged. The presence of ground-to-air antiaircraft missiles represented a rapidly improving air defense capability for the North Vietnamese. As the war progressed, North Vietnam, supplied by China and the Soviet Union, would fashion a very effective and integrated air defense system that proved to be a formidable challenge to American flyers conducting missions over North Vietnam.