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In page Dwight D. Eisenhower:

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Eisenhower introduced the office of White House Chief of Staff – an idea he borrowed from the United States Army. Every president after Lyndon Johnson has appointed staff to this position.[citation needed] As president, Eisenhower also initiated the "up or out" policy that still prevails in the US military. Officers who are passed over for promotion twice are then usually honorably but quickly discharged to make way for younger and more able officers.[citation needed]