Chairman of the Joint Chiefs of Staff
Previously during the presidency of Harry S. Truman and Dwight D. Eisenhower, the chairman of the Joint Chiefs of Staff position was rotated in accordance with the incumbent chairman's armed force service branch. In this rotation, the incoming chairman would be from a different service branch. For example, in 1957, following the retirement of Admiral Arthur W. Radford as Chairman of the Joint Chiefs of Staff, President Eisenhower nominated United States Air Force general Nathan F. Twining as Radford's successor. When General Twining retired, Eisenhower nominated Army general Lyman Lemnitzer to succeed Twining as Chairman of the Joint Chiefs of Staff.