Marine Corps Cpl. Gustavo Ordinola, left, and Sgt. Ryan Boele reinstall a prop rotor hub on an MV-22B Osprey aircraft during Mountain Exercise 6-15 at Mountain West Aviation, South Lake Tahoe, Calif., Oct. 26, 2015. Ordinola and Boele are mechanics assigned to Marine Medium Tiltrotor Squadron 163, Marine Aircraft Group 16, 3rd Marine Aircraft Wing. U.S. Marine Corps photo by Cpl. Allison J. Herman