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Graduates of Airman Leadership School Class 20-A prepare to sing the Air Force Song during the ALS Graduation ceremony at the event center on Goodfellow Air Force Base, Texas, December 12, 2019. ALS is a four-week course designed to prepare senior airmen to assume supervisory duties. (U.S. Air Force photo by Airman 1st Class Robyn Hunsinger)
24.0-70.0 mm f/2.8
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