The 11th Armored Cavalry Regiment ("Blackhorse Regiment" is a unit of the United States Army garrisoned at Fort Irwin, Califo ... rnia. The regiment has served in the Philippine–American War, World War II, the Vietnam War, Cold War, Operation Desert Storm, and Operation Iraqi Freedom (Iraq War). The 11th ACR serves as the Opposing Force (OPFOR) for the Army and Marine task forces, and foreign military forces that train at the National Training Center. read more