The United States Army Corps of Engineers (USACE, also sometimes shortened to CoE) is a U.S. federal agency under the Department of Defense. It is a major Army command made up of some 36,500 civilian and military personnel. Although generally associated with dams, canals and Flood control in the United States, USACE is involved in a wide range of public works throughout the world. The Corps of Engineers provides outdoor recreation opportunities to the public, and provides 24% of U.S. hydropower capacity.