Nigerian, U.S. Marine Corps and Liberian military forces take part in a rehearsal of concept brief on Operation United Shield. The Armed Forces of Liberia and the U.S. formed a combined command known as United Shield to construct Ebola treatment units as part of the Operation United Assistance. 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.