Lt. Col. William Wickersham, 301st Airlift Squadron C-17 Globemaster III pilot, performs a pre-flight inspection July 22, 2017 at Travis Air Force Base, Calif. The aircraft would later perform low-level fying and terrain-masking techniques as part of the 349th Air Mobility Wing's Patriot Wyvern exercise. (U.S. Air Force photo by Senior Airman Shelby R. Horn/Released)