Spc. Tyler Janik, assigned to 501st Aviation Regiment, Combat Aviation Brigade, 1st Armored Division, Task Force Iron Knights, scans the horizon from the back of a CH-47 Chinook helicopter during a mission to Zorzor, Liberia, Jan. 17, 2015. 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)