EBOLA EFFORT U.S. Marines and sailors prepare to load bags of concrete onto an MV-22B Osprey to help local and international health organizations build Ebola treatment units while supporting Operation United Assistance in Monrovia, Liberia, Nov. 21, 2014. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 300111-W-DFA40-732.jpg Photo Gallery