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U.S. Air Force Staff Sgt. Gregory Valdez, a 354th Maintenance Squadron F-35A Lightning II Low Observable Aircraft Structural Maintenance Craftsman, conducts a paste repair on an F-35 test panel Jan. 23, 2020, at the field training detachment (FTD) on Eielson Air Force Base, Alaska. The newly-built detachment is the first F-35 FTD in Pacific Air Forces.