My great uncle, Jack Branham shared a few things about CIA SR with me in 1992 about my grandfather up in north woods Wisconsin before we lost my great uncle back around '96. I have put together what I can about it here:http://imgur.com/gallery/02NgX
Kelly Johnson didn't do wrong, but he didn't get it right. The program had to run it's course through the CIA to be successful. Back in 2008 the CIA burped up paperclip docs that were in it's possession from OSS days post WWII and in those was what is referenced as a turbine less jet engine, since that happened we now have Mach 10 capable scramjet engines. Kelly followed the example of the AQM-60 Kingfisher with a RAMJET and put an afterburner in it when what was intended was in place of the RAM bypass tubes, the scramjet was intended to be implemented there. Could not be done after the fact as after Kelly put the fairing on it and lengthened the airframe it was only capable of withstanding 2.5g. Mach 5 was intended for the final product comparable with Kingfisher but being a piloted craft. After that was done when satellites had taken over recon OXCART was to be placed into NASA.