 The MIM-104 Patriot would combine several new technologies, including the MPQ-53 passive electronically scanned array radar and track-via-missile guidance.Full-scale development of the system began in 1976 and it was deployed in 1984.Patriot was used initially as an anti-aircraft system, but during 1988, it was upgraded to provide limited capability against tactical ballistic missiles (TBM) as PAC-1 (Patriot Advanced Capability-1).