LANGLEY AIR FORCE BASE, Va. – Staff Sgt. Derek Chandler, 1st Equipment Maintenance Squadron low observable technician, mixes paste to be applied to an F-22A Raptor aircraft part Oct. 17. Langley was the first wing to have low observable, or LO, combat-coded aircraft, which necessitated the addition of a low observable section to apply and maintain the stealth coating and composite material on the F-22s. (Photo Courtesy of Mr. Frank Geisler)