U.S. Marine crew chiefs with Marine Medium Tiltrotor Squadron 264 fly in an MV-22 Osprey en route to Camp Leatherneck, Afghanistan, April 19, 2013. Lt. Gen. Robert Neller, commanding general of Marine Corps Forces Central Command, conducted a battlefield circulation visit to Forward Operating Base Shir Ghazay to speak with the Marines of 1st Tank Battalion, Regimental Combat Team 7. (U.S. Marine Corps Photo by Sgt. Tammy K. Hineline/Released)