Staff Sgts. James Bacallo, left, and Joseph Gallegos, 309th Aircraft Maintenance Group Depot Structural Maintenance specialists, from Hill Air Force Base, Utah, analyze blueprints Dec. 11 for the canopy sill longeron repair in Hangar 914 at Luke Air Force Base. The canopy sill longeron strap is responsible for enhancing the structural integrity of the aircraft. (U.S. Air Force photo/Staff Sgt. Luther Mitchell Jr.)