Being a foreign civilian, I don't know much about the details of the capability of either MR2/EO or Reaper, but I would expect that there would be little or nothing that the Reaper can't do that the MR2 can. And it wouldn't need AAR.
Kiwi,
Actually, there are several important MR2 overland capabilities lacking in a Reaper. However, this and some other capabilities recently obtained should go some way to easing the burden on the Nimrod guys.
Regards,
MM