Secretary of Defense Robert S. McNamara (second from left), and Gen Earle Wheeler, chairman of the Joint Chiefs of Staff, huddle in one corner while Ellsworth Bunker, U.S. Ambassador to South Vietnam (second from right), and Gen. William C. Westmoreland, right, commander of U.S. Forces in Vietnam, go over a report at the beginning of briefings for the secretary at U.S. Army Headquarters on Tan Son Nhut Air Base, Friday, July 6, 1967 in Saigon. (AP Photo/Cung)