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JACKSONVILLE, Fla. (Feb. 13, 2023) Sheet metal mechanic Alexander Villar Colon and sheet metal apprentice Evan Durflinger, assigned to Fleet Readiness Center Southeast’s F-5 Production Line, work to replace the upper canopy longeron (UCL) of an F-5N Tiger II. UCLs are the main structural components of the airframe, providing rigidity to the aircraft around the cockpit. (U.S. Navy Photo by Toiete Jackson/Release)