The 321st Cavalry Regiment is a military unit within the United States Army, known for its historic and current roles in reconnaissance, security, and combat operations. Originally established in World War I, this regiment has seen active service across multiple conflicts, including World War II, Vietnam War, and various peacekeeping missions. It operates primarily with a mix of armored vehicles and dismounted infantry units to provide critical intelligence, mobility, and security support on the battlefield. The regiment is part of the United States Army’s Aviation Branch and belongs to the 1st Cavalry Division.