On April 2, 1972, the third day of the Easter Offensive, the largest combined arms operation of the entire Vietnam War, 53-year-old Air Force Lt. Col. Iceal 'Gene' Hambleton was a navigator aboard one of two United States Air Force EB-66 aircraft escorting three B-52s. Bat 21, the call sign for Hambleton's aircraft, was configured to gather signals intelligence, including identifying North Vietnamese anti-aircraft radar installations to enable jamming. (Photo is Bat 21 in Korat Royal Thai Air...