From left, Sam Vigersky, account manager with the U.S. Agency for International Development, Dr. Rene’ Vega, chief medical officer with Heart to Heart International, Maj. Ken Bulthuis, Joint Forces Command – United Assistance, and Willis Plummer, site manager for PAE, sign paperwork handing over a completed Ebola treatment unit to the international aid organizations in Tappita, Liberia, Dec. 27, 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. Army Photo by Sgt. 1st Class Brien Vorhees, 55th Signal Company (Combat Camera) / Released)