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All U.S. military services have pay grades E-1 through E-9 and Commissioned Officer grades O-1 through O-10; all but the Air Force have Warrant Officer pay grades (W).

Individuals in pay grades O-1, O-2, and O-3 with more than four years in an enlisted and/or warrant grade are paid according to the special pay grades of O-1E, O-2E, and O-3E. This benefit does not affect their rank and is usually not referred to except strictly in matters of pay.