• In 1957, he was assigned to the 101st Airborne Division where he served as the Assistant Chief of Staff, G3, until his departure for attendance at the Air War College in July 1959.

• In July 1960, General Singlaub was assigned to the 8th Infantry Division in Germany where he commanded the 16th Infantry. In 1961, he was assigned to Headquarters, Seventh Army, as the Chief of the Training Division of G3.

• In 1963, he returned to the United States for a tour of duty on the Department of the Army General Staff in the Office of the Assistant Chief of Staff for Force Development. He remained in ACSFOR as the Chief of the Force Development Plans Division until February 1966 when he was assigned to the Office of the Chief of Staff, Army.

• In May 1966, General Singlaub was assigned to Vietnam where he served as the Chief, Studies and Observation Group of the U. S. Military Assistance Command, Vietnam, until August 1968 when he departed Vietnam for assignment in Germany.

• On 24 August 1968, General Singlaub assumed duties as the Assistant Division Commander, Maneuver, 8th Infantry Division in Bad Kreuznach, Germany.