Staff Sgts. James Bacallo, left, and Joseph Gallegos analyze blueprints for an F-16D Fighting Falcon canopy seal longeron repair Dec. 11, 2014, at Luke Air Force Base, Ariz. The CSL strap is responsible for enhancing the structural integrity of the aircraft. Both Airmen are 309th Aircraft Maintenance Group depot structural maintenance specialists from Hill Air Force Base, Utah. (U.S. Air Force photo/Staff Sgt. Luther Mitchell Jr.)