U.S. Air Force Capt. Jason Markzon, a 13th Fighter Squadron pilot, tests his MBU 20/P breathing mask at Misawa Air Base, Japan, Feb. 8, 2017. Before take-off, a preflight check is performed by aircrew flight equipments Airmen, ensuring all equipment functions properly. (U.S. Air Force photo by Airman 1st Class Sadie Colbert)
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