United States Army South is an Army service component command of United States Southern Command whose area of responsibility includes 31 countries and 15 areas of special sovereignty in Central and South America and the Caribbean. It is headquartered at Fort Sam Houston, Texas.

The United States Southern Command (USSOUTHCOM), located in Doral in Greater Miami, Florida, is one of the eleven unified combatant commands in the United States Department of Defense. It is responsible for providing contingency planning, operations, and security cooperation for Central and South America, the Caribbean, their territorial waters, and for the force protection of U.S. military resources at these locations. USSOUTHCOM is also responsible for ensuring the defense of the Panama Canal and the canal area.