LANGLEY AIR FORCE BASE, Va. - Senior Airman Victor Sylvan, 1st Equipment Maintenance Squadron low observable aircraft structural maintenance journeyman, removes a panel from an F-22 Raptor in preparation to apply low observable coatings. Low observable is the process of a coating stack being applied on an F-22 that makes it invisible to radar, allowing the aircraft to remain undetected. (U.S. Air Force photo/Senior Airman Dana Hill)