Originally published by the U. S. Army in 1993 to mark the 20th anniversary of the Army's establishment of the Training and Doctrine Command, or TRADOC, as the major innovation in its post-Vietnam War organization. The Office of the Command Historian has produced a historical assessment that surveys the reasons for the 1973 reorganization and the role TRADOC played in carrying out its assigned mission responsibilities as the instrument for change and development in the Army.