U.S. and Liberian Armed Forces board a U.S. Marine Corps MV-22B Osprey to conduct site surveys during Operation United Assistance in Monrovia, Liberia, Oct 22, 2014. United Assistance is a Department of Defense operation established to contain the Ebola Virus outbreak in Western African nations. The operation provides command and control, logistics and engineering support to the U.S. Agency for International Development. (U.S. Marine Corps photo by Lance Cpl. Andre Dakis/SP-MAGTF Crisis Response Africa Combat Camera/Released)