Sergeant Tyler W. Envall, an H-1 avionics technician with the 24th Marine Expeditionary Unit’s Aviation Combat Element, Marine Medium Tiltrotor Squadron 365 (Reinforced), conducts 90-degree gear box wiring of a UH-1Y Huey aboard the USS Iwo Jima, Oct. 27, 2014. Marines conduct flight maintenance around the clock to maintain mission readiness for all MEU aircraft. (U.S. Marine Corps photo by Sgt. Devin Nichols)