Airman James Rogers, a 361st Training Squadron aircrew flight equipment apprentice course student, assembles the MDU-20 pressure demand system at Sheppard Air Force Base, Texas, on June 9, 2020. The MDU-20 is part of the HGU 55P helmet used by aircrew during flight. Rogers is in block 1 of the apprentice course and scheduled to graduate Aug. 17, 2020. (U.S. Air Force photo by Alan R. Quevy)