U.S. Air Force Airmen 1st Class Allan Calangan and Chandler Brown, 755th Aircraft Maintenance Squadron aerospace propulsion apprentices, work on a progress check exam during a course at the 372nd Training Squadron, Detachment 11 at Davis-Monthan Air Force Base, Ariz., Oct. 3, 2016. The students and teacher complete the progress check exams to ensure material comprehension. (U.S. Air Force photo by Senior Airman Betty R. Chevalier)
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