U.S. Air Force Col. Wayne M. Pritt, left, the commander of the 633rd Medical Group, briefs redeployers at Joint Base Langley-Eustis, Va., Oct. 20, 2014. The team was part of U.S. Africa Command's Joint Task Force United Assistance and constructed an expeditionary field hospital for the U.S. Public Health Service's use in caring for international medical workers. 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.