The 517th Air Defense Artillery Regiment is a military unit under the United States Army. This regiment specializes in air defense operations, protecting forces and territories from potential aerial threats. Version 2 of this regiment, specifically, may refer to an updated or reorganized structure, tactics, or equipment. The 517th ADA Regiment has a history that dates back to World War II, with notable service in the Korean and Vietnam Wars. Current operations and deployments may involve missile defense systems, radar surveillance, and control of airspace within its assigned areas.