The respectively nicknames were given at the time so that the two men could be more easily distinguished.
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Charles Erwin Wilson (July 18, 1890 - September 26, 1961), American businessman and politician, was United States Secretary of Defense from 1953 to 1957 under President Eisenhower.
Wilson indicated his intention to retire from office shortly after the start of the second Eisenhower term and left on 8 October 1957.
Charles Erwin Wilson should not be confused with the Charles E. Wilson who was the CEO of General Electric and served President Truman as the head of the Office of Defense Mobilization.