U.S. Army Pvt. Nikkolaus Carr, 128th Aviation Brigade Advanced Individual Training student, works on a UH-60 Blackhawk’s main rotator rotor hub at Fort Eustis, Va., June 18, 2015. The 128th Avn. Bde. trains on a variety of the aircraft’s maintenance, hydraulic and rotor systems as well as trouble shooting practices. (U.S. Air Force photo by Staff Sgt. Natasha Stannard/Released)