Staff Sgt. Ryan Oliver, 40th Helicopter Squadron special missions aviator, inspects the rotor on a UH-N1 Huey Jan. 27, 2015, at Malmstrom Air Force Base, Mont. Oliver completes a pre-flight inspection prior to each flight to ensure there are no mechanical faults in the aircraft. (U.S. Air Force photo/ Airman 1st Class Dillon Johnston)