The Hughes AN/ASB-19 Angle Rate Bombing System (ARBS) is an avionics system originally designed for US Marine Corps attack aircraft to improve day and night bombing accuracy when operating in the close support role using unguided weapons. Externally or nose mounted, ARBS is a target designator which weighs less than 63 kg (140 lb) and includes an automatic scan laser and a pilot-controlled tracking television, both using a common optical system.