U.S. Army Pvt. Nikkolaus Carr, 128th Aviation Brigade Advanced Individual Training student, works on a UH-60 Blackhawk’s main rotor hub at Fort Eustis, Va., June 18, 2015. Carr was connecting a scissor link, which connects two plates together enabling the aircraft’s blades to rotate. (U.S. Air Force photo by Staff Sgt. Natasha Stannard/Released)