Following World War II, DePuy attended the
United States Army Command and General Staff College. After graduation, he served in myriad command and staff positions, including command of the 2d Battalion,
8th Infantry,
4th Infantry Division, and the 1st Battle Group, 30th Infantry,
3d Infantry Division, both in the Federal Republic of Germany. In 1948 he attended the
Defense Language Institute for a year to learn Russian, followed in 1949 by assignment as Assistant Military Attaché, and later the acting Army Attaché in
Budapest, Hungary. In 1953, DePuy began attendance at the
Armed Forces Staff College, followed by assignment to the Office of the Chief of Staff of the United States Army, where he worked on modernization of Army force structure, doctrine and training policies. In 1960, DePuy was a student at the
Royal College of Defence Studies. DePuy met Marjory Kennedy Walker of
Salem, Virginia, a Far East specialist who served with both the
Office of Strategic Services and the
Central Intelligence Agency, and they were married in June 1951. A son, William E DePuy Jr. was born in July 1952, and daughters Joslin and Daphne in July 1953 and 1954, respectively. ==Vietnam War==