From the left, Pvt. 1st Class Tieyu Zhang and Sgt. Gregory Brown with the 227th Quartermaster Company, 129th Combat Sustainment Support Battalion, 101st Sustainment Brigade, Task Force Lifeliners, Joint Task Force - United Assistance, sets up a barricade prior to employing a tactical water purification system (TWPS) at a waterfront in Buchanan, Liberia, on Jan. 8, 2015. The TWPS is a logistical capability that is used to provide clean water for forces supporting Operation United Assistance. Operation United Assistance is a Department of Defense operation in Liberia to provide logistics, training and engineering support to U.S. Agency for International Development-led efforts to contain the Ebola virus outbreak in western Africa. (U.S. Army photo by Sgt. 1st Class Mary Rose Mittlesteadt, 101st Sustainment Brigade Public Affairs/RELEASED)