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The capabilities of the F-35 HMDS are way beyond that of JHMCS, but it is a integral  part of the F-35 navigation, flight control  and weapons systems and as such is not really adaptable to other aircraft.  To put something like that into F-22 would be extremely expensive and would essentially be a new, custom application.   As you state, parts of  it would be duplicative of some of the displays used by  Raptor. 


Regarding JHMCS, F-22 was started before Helmet Mounted Sights were a big deal in the West (outside of Israel).  It wasn't until the MiG-29 and SU-27 systems were examined that it was realized how significant they were and what else you could do with them.  USAF in the '90s said Raptor didn't need them anyway because no one would ever get close to an F-22.  My understanding of the technical issue had to do with mapping of the F-22 cockpit being the problem.    Possibly the simpler DASH system could be fitted, assuming the money is there, but I haven't heard anything about that.


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