U.S. Marine Corps Lance Cpl. Eric Zientek, attached to Special-Purpose Marine Air-Ground Task Force – Crisis Response, performs maintenance on an MV-22B Osprey, preparing the aircraft for the next mission in support of Operation United Assistance, Nov. 17, 2014, Roberts International Airport, Liberia. The Osprey requires maintenance before and after flight check to ensure it is mission capable in support of Operation United Assistance. United Assistance is a Department of Defense operation in Liberia to provide logistics, training and engineering support to U.S. Agency for International Development-led efforts to contain the Ebola virus outbreak in western Africa. (U.S. Army photo by Pfc. Rashene Mincy, 55th Signal Company (Combat Camera)/Released)