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U.S. Air Force Staff Sgt. Dylan Wyant 35th Fighter Wing information security systems officer, connects an oxygen mask to a combined aircrew system tester during the initial preparation for an F-16 Fighting Falcon familiarization flight at Tsuiki Air Base, Japan, Oct. 2, 2017. A CAST tests an oxygen mask seal once fitted to an individual’s face. Aircrew flight equipment technicians care for all equipment pilots carry, as well as the equipment installed inside an aircraft. The day-to-day equipment pilots need, such as a helmet and harness receives inspections every day, while most of the equipment installed inside the jet can be inspected monthly or annually.