Soldiers from Task Force Iron Knights, 2nd Battalion, 501st Aviation Regiment, 1st Combat Aviation Brigade, 1st Armored Division, perform maintenance on a CH-47 Chinook helicopter parked on the flight line at James Spriggs Payne Airfield Dec. 13, 2014. The Iron Knights directly supports Joint Forces Command – United Assistance through aviation operations across Liberia. 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. Jose Ramirez, Joint Forces Command – United Assistance Public Affairs/RELEASED)