The USAF has around 500 F-15s; active-duty 
   units operate F-15C/Ds while the Air National Guard squadrons are equipped largely with 
   older F-15A/Bs. 
     
   
   The 
   Multi-Stage Improvement II upgrade for F-15C/Ds adds APG-70 radar, 
   AIM-120 AMRAAM capability, improved electronic counter measures equipment and the 
   joint tactical information 
   datalink system. The F-15A/Bs are gaining elements of the 
   Multi-Stage Improvement II, as well as improved Dash 220E engines. 
   Their radars are being upgraded to APG-63(V)1 standard that 
   incorporates features of the APG-70. Due to its capabilities the 
   F-15 has only been exported to its most trusted allies. Israel has three units that are all 
   based at Tel Nof; one unit operates the 13 ex-USAF F-15A/Bs 
   delivered to Israel after Desert Storm. Saudi Arabia received 96 
   F-15C/Ds and equip five squadrons. It is likely that F-15s serving 
   with Israel and Saudi Arabia will receive all or elements of the 
   Multi-Stage Improvement II upgrade.
      Delivered from 1979 to 1996, the 
   Japan Air Self-Defence Force procured a 
   total of 163 F-15Js and 50 F-15DJs, all but 16 of which were 
   manufactured under licence by Mitsubishi Heavy Industries. The 
   F-15J/DJs are almost identical to USAF's F-15C/Ds, but lack the US 
   tactical electronic warfare system and are therefore fitted with 
   indigenous electronic warfare equipment. Japanese F-15 improvements include a radar 
   and central computer upgrade, to a standard comparable to the USAF's 
   Multi-Stage Improveent II F-15s. Other elements include upgraded 
   electronic counter measures systems along 
   with new forward-looking infra-red and infra-red search and track systems. With these modifications, the F-15J 
   will have the capability to carry fire-and-forget beyond visible 
   range air-to-air missiles and 
   possess much more resistance to any future electronic warfare threat. Production 
   modifications are targeted for FY04, and about 100 F-15Js are 
   planned to be covered by the upgrade. The F-15J/DJs primarily equip 
   eight fighter intercept squadrons - a seven F-15DJs also serve with 
   an aggressor unit.


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