William B. Caldwell, IV (born January 24, 1954) is a retired United States Army Lieutenant General and the current President of Georgia Military College. His final active-duty military assignment was Commanding General of United States Army North (Fifth Army), a position his father held from 1978–1980. In his role as the commander of Army North, LTG Caldwell also served as the senior U.S. Army commander of Fort Sam Houston, which is part of Joint Base San Antonio.Prior to his assignment at Fort Sam Houston, Caldwell served as the Commander of NATO Training Mission – Afghanistan, and simultaneously as the Commander of Combined Security Transition Command – Afghanistan. Other command assignments include the United States Army Combined Arms Center, and the 82nd Airborne Division.