U.S. Marines and Airmen and Soldiers with the 101st Airborne Division board an Air Force C-17 Globemaster III aircraft at Léopold Sédar Senghor International Airport in Dakar, Senegal, Oct. 19, 2014. The Service members were bound for Monrovia, Liberia, to construct medical treatment units and train health care workers as part of Operation United Assistance, 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.