Ya Gotta Have A Middle Name, See
 
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In the U.S. armed forces everyone is assumed to have no fewer than three names. If there is no middle name or initial, that fact is noted in parentheses (NMI).

Sometimes rookies, seeing NMI as part of another man's name, may say, "You gotta helluva funny middle name. Dya call it Nummy, or what?"

When an initial is shown on one's birth certificate instead of a name, the word (only) is placed after it by the armed forces. So Captain Harry S. Truman was officially Harry S. (only) Truman.

Hook, J. N. The Book of Names, A Celebration of Mainly American Names: People, Places, and Things. Franklin Watts, 1983.