"[326]
Since the 19th century, many if not all presidents were assisted by a central figure or "gatekeeper", sometimes described as the president's private secretary, sometimes with no official title at all.[327] Eisenhower formalized this role, introducing the office of White House Chief of Staff – an idea he borrowed from the United States Army. Every president after Lyndon Johnson has also appointed staff to this position. Initially, Gerald Ford and Jimmy Carter tried to operate without a chief of staff, but each eventually appointed one.
As president, Eisenhower also initiated the "up or out" policy that still prevails in the U.S. military. Officers who are passed over for promotion twice, are then usually honorably but quickly discharged, in order to make way for younger, and more able officers. (As an army officer, Eisenhower had been stuck at the rank of major for 16 years in the interwar period.)On December 20, 1944, Eisenhower was appointed to the rank of General of the Army, placing him in the company of George Marshall, Henry "Hap" Arnold, and Douglas MacArthur, the only four men to achieve the rank in World War II. 