Deborah Malac, U.S. Ambassador to Liberia, and Maj. Gen. Darryl A.Williams, commanding general of U.S. Army Africa, walk toward a U.S. Marine MV-22 Osprey at a landing zone near Tubmanburg, Liberia. The U.S. Agency for International Development is the lead U.S. Government organization for Operation United Assistance. U.S. Africa Command is supporting the effort by providing command and control, logistics, training and engineering assets to contain the Ebola virus outbreak in West African nations.