U.S. Airmen assigned to the 633rd Medical Operations Squadron exit a bus as they return to Joint Base Langley-Eustis, Va., Oct. 20, 2014, from a deployment to West Africa. The Airmen were deployed to West Africa to deliver a modular medical treatment facility and train international health care workers to use the equipment as part of Operation 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.