Pvt. 1st Class Tieyu Zhang with the 227th Quartermaster Company, 129th Combat Sustainment Support Battalion, 101st Sustainment Brigade, Task Force Lifeliners, Joint Task Force - United Assistance, prepares a pump to be put into the seawater as part of the employment of 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)