During World War II he served as the Assistant Chief of Staff of IX Corps, and later in 1942 as Deputy Chief of Staff of the China-Burma-India Theater of Operations.
During the Korean War he commanded the IX Corps, and after that assignment served as Commander in Chief, Allied Land Forces South-Eastern Europe (NATO) from 1952 to 1954, followed by command of Sixth United States Army from 1954 to 1955.