U.S. Air Force Senior Airman Edgar Perez, 71st Rescue Squadron loadmaster, rests his eyes after his turn scanning the valley floor in search of a downed Air National Guard F-15C Eagle pilot Aug. 28, 2014, in the skies over the Shenandoah Valley, Va. Crewmembers aboard an HC-130P Combat King scanned in 30-minute shifts to keep their eyes fresh. (U.S. Air Force photo by Airman 1st Class Ryan Callaghan/Released)

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Photo by: Airman st Class Ryan CallaghanReleased |  VIRIN: 140828-F-NI493-012.JPG