The Phu Loi flight line was a bustle of activity. 19 July 1971 was a typical day at this helicopter base northwest of Saigon. It was 08:30 and flights of Huey's took off en route for their assigned combat assaults. The familiar whump, whump, whump of their rotors beating the air echoed in my ears. They would pick up their cargo of soldiers and venture out to jungle and rice paddy in an attempt to make contact with Charlie.