U.S. Marine Corps MV-22B Ospreys from SPMAGTF Crisis Response-Africa prepare to conduct aerial reconnaissance of landing zones, at night, in support of Operation United Assistance in Monrovia, Liberia, Nov. 1, 2014. United Assistance is a Department of Defense operation to provide command and control, logistics, training, and engineering support to U.S. Agency for International Development efforts to contain the Ebola virus outbreak in West African nations. (U.S. Marine Corps photo by Lance Cpl. Andre Dakis/SP-MAGTF Crisis Response Africa Combat Camera/Released)