ELMENDORF AIR FORCE BASE, Alaska -- Staff Sgt. Catherine Fenin, 3rd Logistics Readiness Squadron, weighs a filter on an analytical scale, in preparation for a Stored Energy System (SES) purge. The SES aids the F-22 Raptor in rebooting engines while in flight. The filter is weighed prior and after the purge to check weight of contamination running through the SES. (U.S. Air Force photo/Staff Sgt. Joshua Garcia)
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