U.S. Marines with Special-Purpose Marine Air-Ground Task Force - Crisis Response - Africa conduct maintenance on MV-22B Ospreys in support of Operation United Assistance in Monrovia, Liberia, Oct. 10, 2014. Operation United Assistance is part of a comprehensive U.S. Government effort, led by the U.S. Agency for International Development, to respond to and contain the outbreak of the Ebola virus in West Africa as quickly as possible. (U.S. Marine Corps photo by Lance Cpl. Andre Dakis/SPMAGTF Crisis Response - Africa Combat Camera/Released)