Riggers with the 372nd Inland Cargo Transportation Company watch a CH-47 Chinook helicopter from Task Force Iron Knights hover above a dropped sling load during an airlift operation at Roberts International Airport, Liberia, Dec. 12, 2014. The mission was to airlift incinerators to a new Ebola treatment unit built in support of Operation United Assistance. Task Force Iron Knights is comprised of element of the 2nd Battalion, 501st Aviation Regiment, Combat Aviation Brigade, 1st Armor Division deployed as part of Joint Forces Command – United Assistance. United Assistance is a Department of Defense operation to provide command and control, logistics, training and engineering support to U.S. Agency for International Development-led efforts to contain the Ebola virus outbreak in West African nations. (U.S. Army Photo by Sgt. 1st Class Brien Vorhees, 55th Signal Company (Combat Camera) / Released)