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AB is the abbreviation for the rank of Airman Basic in the United States Air Force. An Airman Basic is a junior enlisted member serving in the pay grade of E-1, the lowest military pay grade. Most members of the Air Force enter military service as an Airman Basic, however, some recruits with college credits or other incentives may enlist at a higher rank. An Airman Basic is focused upon learning and adapting to military culture, and learning what is expected of them as an airman.
Most members will be an Airman Basic during their basic military training and technical training for their job. Depending upon the length of technical training, some airmen may promote to E-2 during technical training. The time in service/time in grade requirement for promotion to E-2 is six months.