to deliver an additional 40 radars to the Republic of Korea Air Force for the F-15K Slam Eagle. AN/APG-63(V)2 The APG-63(V)2 Active electronically scanned array (AESA) radar has been retrofitted to 18 U.S. Air Force F-15C aircraft. This upgrade includes most of the new hardware from the APG-63(V)1, but adds an AESA to provide increased pilot situational awareness. The AESA radar has an exceptionally agile beam, providing nearly instantaneous track updates and enhanced multi-target tracking capability. The APG-63(V)2 is compatible with current F-15C weapon loads and enables pilots to take full advantage of the AIM-120 AMRAAM's capabilities, simultaneously initiating guidance for multiple missiles to several targets widely spaced in azimuth, elevation, or range. AN/APG-63(V)3 The APG-63(V)3 radar is a more modern variant of the APG-63(V)2, applying the same AESA technology utilized in Raytheon's APG-79. The (V)3 is currently being retrofitted into F-15C/D and deployed in Singapore's new F-15SG aircraft and Saudi Arabia's new F-15SA aircraft. Raytheon delivered the first prototype APG-63(V)3 system in June 2006. The company started work on an initial production order in October 2007. AN/APG-64 AN/APG-64 was a development of AN/APG-63. It did not enter service. AN/APG-70 The APG-70 was a 1980s redesign of the APG-63 for greater reliability and easier maintenance. Additionally, gate array technology enabled the APG-70 to incorporate new modes with enhanced operational capabilities. To reduce production costs, many of the upgraded radar's modules are common with the F/A-18's APG-73 radar, while the computers / processors share an 85% commonality with that of the F-14's APG-71 radar. APG-70 systems were originally installed on later model F-15C/D aircraft, but have since been replaced on those aircraft by the APG-63(V)1. As with the basic APG-63, the APG-70 is no longer in production; but were in service on the F-15E Strike Eagle, the Israeli F-15I and the Saudi F-15S. Also, as with APG-63, APG-70 also comes in two versions, both have identical air-to-air capabilities, but slightly different air-to-ground capabilities: APG-70 on F-15Is and F-15Ss exported to foreign customers has lower performance in that the resolution of Doppler Beam Sharpening (DBS) / Mapping / Synthetic Aparture Radar (SAR) modes for the APG-70 on F-15E of USAF were at least three times better than that of the APG-70 on F-15I and F-15S. From 2017, the APG-70s on Israeli F-15Is were planned to be removed and replaced with the APG-82(V)1. AN/APG-82(V)1 The AN/APG-82(V)1 combines the processor of the APG-79 used