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.

U.S. Army South's currently officially stated mission is to conduct and support multinational operations and security cooperation in the United States Southern Command area of responsibility in order to counter transnational threats and strengthen regional security in defense of the homeland.

On 1 July 1917, the Panama Canal Department was established as a separate geographic command with headquarters at Quarry Heights.

In the late thirties, events in Europe and technological developments, such as the aircraft carrier and long-range bombers, precipitated construction of more modern defences, a network of roads, and Albrook Field.

Fort Sherman became the home for USARCARIB's Jungle Warfare Training Center (JWTC), which ran up to ten three-week courses per year.

Secretary of Defense Robert McNamara decided to bolster available U.S. Army forces in the Caribbean area in 1961, after the failed Bay of Pigs Invasion and rumours of Soviet assistance to Cuba.

Operation Just Cause, the United States military action used to depose Panamanian dictator, General Manuel Antonio Noriega, was officially conducted from 20 December 1989 to 31 January 1990.

[6] On 14 October 1994 the 193d Infantry Brigade was the first major unit to inactivate in accordance with the Panama Canal Treaty of 1977 which mandated U.S.