U.S. Marines and Sailors with Special-Purpose Marine Air-Ground Task Force - Crisis Response - Africa arrive in Monrovia, Liberia to support Operation United Assistance, Oct. 9, 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) Africa Combat Camera/Released)