The second United States occupation of the Dominican Republic began when the United States Marine Corps entered Santo Domingo on April 28, 1965 in the Dominican Civil War. They were later joined, beginning the following day, by most of the United States Army's 82nd Airborne Division and its parent XVIIIth Airborne Corps. It was called "Operation Power Pack." The intervention ended in September 1966 when the 1st Brigade of the 82nd Airborne, the last remaining American unit in the country, was withdrawn.