Takeoff Prep Air Force Staff Sgt. Samantha Grendahl prepares a KC-135 Stratotanker for takeoff during an exercise at Andersen Air Force Base, Guam, Feb. 25, 2020, as part of Cope North, an annual trilateral field training exercise. SHARE: Download: Full Size (1.52 MB) Tags: Air Force Credit: Air Force Senior Airman Gracie Lee VIRIN: 200225-F-LT717-0378M.JPG Photo Gallery