Corporal Dillon Hanner, a crew chief with the 24th Marine Expeditionary Unit’s Aviation Combat Element, Marine Medium Tiltrotor Squadron 365 (Reinforced), sands the “dorsal fin” of a CH-53E Super Stallion aboard the USS Iwo Jima, Oct. 15, 2014. MEU aircraft undergo several mandatory hours of maintenance checks before each flight. (U.S. Marine Corps photo by Sgt. Devin Nichols)