William B. Caldwell, IV (born 1954),United States Army Lieutenant General, serving as the commanding general of United States Army North (Fifth Army), a position his father held from 1978-1980. LTG Caldwell also served as the senior U.S. Army commander of Fort Sam Houston, which is part of Joint Base San Antonio. Early 2013 (February), LTG Caldwell announced that he would be retiring from the Army later in the year, and that he had accepted appointment as President of Georgia Military College.