U.S. Air Force Maj. Cory Bartholomew, U-2 Dragon Lady pilot from the 9th Reconnaissance Wing, adjusts his helmet during pre-flight procedures at RAF Fairford, United Kingdom, June 6, 2014. Both the helmet and pressure suit worn by U-2 pilots must be properly fitted to ensure maximum functionality. (U.S. Air Force photo by Staff Sgt. Jarad A. Denton/Released)