Deep concentration
Tech. Sgt. Caleb Hiner, a special missions aviator for the 305th Rescue Squadron, Davis-Monthan Air Force Base, Ariz., communicates with his crew mates about the upcoming air-refueling exercise June 19, 2014. Hiner will be flying on an HH-60G Pave Hawk helicopter that is capable of flying up to 504 nautical miles. (U.S. Air Force photo/Senior Airman Natasha Dowridge)
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