Members of Samaritan's Purse, an international relief group, finish offloading bags of concrete from an MV-22B Osprey, assigned to SPMAGTF Crisis Response – Africa, that will be used to build Ebola Treatment Units while in support of Operation United Assistance in Monrovia, Liberia, Nov. 21, 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- led efforts to contain the Ebola virus outbreak in West African nations. (U.S. Marine Corps photo by Lance Cpl. Andre Dakis/SPMAGTF-CR-AF Combat Camera/Released)