U.S. Marines with Combat Logistics Battalion 31, 31st Marine Expeditionary Unit (MEU), prepare to board a MV-22 Osprey assigned to Marine Medium Tiltrotor Squadron 262 (Reinforced), 31st MEU, during a mass casualty evacuation exercise as part of amphibious intergration training aboard the USS Green Bay (LPD 20), at sea, March 10, 2015. The Marines and Sailors are currently conducting their Spring Patrol of the Asia-Pacific region. (U.S. Marine Corps photo by GySgt Ismael Pena/Released)