By Airman 1st Class Azaria E. Foster, Joint Base McGuire-Dix-Lakehurst Public Affairs / Published June 01, 2021 A U.S. Air Force KC-10 Extender pilot looks out the window after landing May 16, 2021, at Oscoda - Wurtsmith airport, Michigan, in support of Mobility Guardian 2021. Conducted biennially, Mobility Guardian is the Air Force’s only formal, Total Force, service-level mechanism for assessing and validating capabilities in Rapid Global Mobility missions specified and implied within the 2018 National Defense Strategy. (U.S. Air Force photo by Senior Airman Charles T. Fultz) A U.S. Air Force KC-10 Extender sits on the flight line before takeoff May 19, 2021, at Oscoda - Wurtsmith airport, Michigan, in support of Mobility guardian 2021. Conducted biennially, Mobility Guardian is the Air Force’s only formal, Total Force, service-level mechanism for assessing and validating capabilities in Rapid Global Mobility missions specified and implied within the 2018 National Defense Strategy. (U.S. Air Force photo by Senior Airman Charles T. Fultz.)