Discusses his selection as head of Air Force phase of Manhattan Project; B-29 squadron personnel for Project Silver Plate; choice of training sites; security control; personnel's understanding of mission; modification of B-29; training program; target selection; practice mission mission against Japan; dropping the bomb on Nagasaki; use of nuclear bombs; detrimental effects on career; lack of USAF and U. S. government support in face of criticism for action in World War II; chain of command of 509th Composite Group.