The 7th Cavalry Regiment is a United States Army cavalry regiment formed in 1866. Its official nickname is "Garryowen",after the Irish air "Garryowen" that was adopted as its march tune. The regiment participated in some of the largest battles of the Indian Wars, including the infamous Battle of Little Bighorn, where its enigmatic commander, Lieutenant Colonel George A. Custer made his last stand. The 7th Cavalry became part of the 1st Cavalry Division in the 1920s and went on to fight in the Pacific Theater of World War II, and several key battles of the Korean War, in which it committed the No Gun Ri massacre, and participated in the Vietnam War. It distinguished itself in the Gulf War and in the Global War on Terror where its Squadrons and Battalions now serve as Combined Arms Battalions (involving tanks and mechanized infantry) or as reconnaissance squadrons for Brigade Combat Teams.