The 75th Ranger Regiment is an elite airborne light infantry combat formation within the United States Army Special Operations Command (USASOC). The six battalions of the modern Rangers have been deployed in Korea, Vietnam, Afghanistan, and Iraq, and saw action in several conflicts, such as those in Panama and Grenada. The Ranger Regiment traces its lineage to three of six battalions raised in World War II, and to the 5307th Composite Unit (Provisional)—known as "Merrill's Marauders", and then reflagged as the 475th Infantry, then later as the 75th Infantry.