U.S. Airmen board a bus on the flight line after arriving at Ramstein Air Base, Germany, from West Africa Oct. 19, 2014, during Operation United Assistance. Any personnel traveling into Ramstein from Ebola-infected areas were medically screened upon their arrival and cleared by public health for onward travel to ensure the health and safety of all. 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.