Short Range Air Defense (SHORAD) is a group of anti-aircraft weapons and tactics that have to do with defense against low-altitude air threats, primarily helicopters and low-flying close air support aircraft such as the A-10 or MiG-27. SHORAD and its complements, HIMAD (High to Medium Air Defense) and THAAD (Terminal High Altitude Area Defense) divide air defense of the battlespace into domes of responsibility based on altitude and defensive weapon ranges.