Staff Sgt. Jose Ibarra, U.S. Air Force Air Demonstration Squadron flight equipment specialist, conducts a 30-day breakdown inspection of helmets and oxygen masks at the Thunderbirds Hangar on Nellis Air Force Base, Nev., Feb. 9, 2015. The Thunderbirds squadron is an Air Combat Command unit composed of eight pilots, including six demonstration pilots, four support officers, three civilians and more than 130 enlisted personnel performing in 25 career fields. (U.S. Air Force photo by Staff Sgt. Kristina Overton)
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