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MAJ is the abbreviation for the rank of Major in the United States Air Force. A Major is a commissioned officer in the rank of O-4. Majors fall in the middle tier of commissioned officer ranks, also called the Field Grade Officer ranks. A major usually serves as a liaison between a unit commander and the members of the unit, but some may also serve as commanders of smaller units in the Air Force, to include flights and some smaller squadrons. To be promoted to the rank of major, a captain must have a total of at least ten years time in service, and at least three years time in grade as a captain. Typically only 80% of eligible captains are promoted to the rank of major.