A U.S. Marine Corps MV-22B Osprey with SPMAGTF Crisis Response - Africa returns to base after dropping off supplies that will be used by local and international health organizations to build Ebola Treatment Units while in support of Operation United Assistance in 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)