From left, Navy Lt. Vincent Trejo, a San Antonio native and a project officer for the 36th Engineer Brigade, briefs Col. Heath Roscoe, commander of 36th Engineer Brigade, on the unit’s status before it's handed over to U.S. Agency for International Development, Jan. 2, 2015, Zorzor City, Liberia, in support of Operation United Assistance. Operation United Assistance is a Department of Defense operation in Liberia to provide logistics, training and engineering support to USAID-led efforts to contain the Ebola virus outbreak in western Africa. (U.S. Army photo by Sgt. Ange Desinor, 13th Public Affairs Detachment /RELEASED)