Staff Sgt. Terrance Walker and Tech. Sgt. Stephen Bartorillo, 9th Maintenance Squadron repair and reclamation craftsmen, perform phase maintenance on a U-2 Dragon Lady Jan. 3, 2019, at Beale Air Force Base, California. Airmen from the 9th MXS phase dock often go TDY to Osan Air Base, Republic of Korea to perform a phase on the jets there. (U.S. Air Force photo by Senior Airman Tristan D. Viglianco)