U.S. Air Force Airman 1st Class Shelby Bowling performs preflight checks on Al Udeid Air Base, Qatar, Dec. 31, 2015, to support Operation Inherent Resolve. Bowling is a boom operator assigned to the 340th Expeditionary Air Refueling Squadron. The squadron reached a significant milestone in 2015 by flying more than 100,000 combat hours. U.S. Air Force photo by Tech. Sgt. Nathan Lipscomb