Petty Officer 2nd Class Joseph Villarreal inspects a pair of night vision goggles for scratches on the lenses and to ensure it has free movements during Red Flag-Alaska April 23. Red Flag-Alaska is a Pacific Air Forces-directed field training exercise for U.S. and coalition forces flown under simulated air-combat conditions. PO2 Villarreal is an aviation life support equipment technician assigned to Naval Air Station Whidbey Island, Wash. (U.S. Air Force photo/Senior Airman Christopher Boitz)