A regimental combat team was a provisional major infantry unit of the United States Army during World War II and the Korean War, and of the U.S. Marine Corps to the present day. The regimental combat team, or "R.C.T.", is formed by augmenting a regular infantry regiment with smaller tank, artillery, combat engineer, mechanized, cavalry, reconnaissance, Signal Corps, air defense, quartermaster, military police, medical, and other support units to enable it to be a self-supporting organization in the combat field.