A local worker watches as a Ch-47F Chinook helicopter from Task Force Iron Knights, 2nd Battalion, 501st Aviation Regiment, 1st Combat Aviation Brigade, 1st Armored Division, taxis along the runway at Roberts International Airport, Monrovia, Liberia, before heading out on a mission in support of Operation United Assistance, Dec. 10, 2014. The TF Iron Knights deployed to Liberia from Fort Bliss, Texas. 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 Staff Sgt. David Meyer, 27th Public Affairs Detachment/Released)