F-35 helmet
U.S. Air Force Tech. Sgt. Anthony Farnsworth, 419th Operations Support Squadron, adjusts an F-35 helmet during optical fit training at Hill Air Force Base, Utah, on July 10, 2021. Each helmet is inspected every 105 days and has a 120-day fit check to ensure its functionality and safety. (U.S. Air Force photo by Senior Airman Erica Webster)

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Photo by: Senior Airman Erica Webster |  VIRIN: 210710-F-KM531-1870.JPG