LEAVING LIBERIA U.S. troops deployed to support Operation United Assistance cross the airfield at Roberts International Airport near Monrovia, Liberia, Jan. 6, 2015, before their flight back to a U.S. base. All troops will go through 21 days of controlled monitoring. The Defense Department operation provides logistics, training and engineering support to U.S. Agency for International Development-led efforts to contain the Ebola virus outbreak in West Africa. SHARE: Download: Full Size (0.06 MB) Credit: VIRIN: 012876-A-MYQ89-901.jpg Photo Gallery