Royal Australian Air Force Maj. Andrew Jackson, 61st Fighter Squadron RAAF squadron leader, performs pre-flight checks in an F-35 A Lightning II at Luke Air Force Base, Arizona, May 14, 2015. Pre-flight checks help ensure the aircraft is fit and flight ready. Jackson was the first Australian pilot to fly the F-35 at Luke. (U.S. Air Force photo by Senior Airman James Hensley)