the airframes themselves are aging, but virtually every version in the fleet has undergone extensive upgrades, from electronics to operator stations and engines. Chances are that aircraft was an RC-135 V/W “RIVET JOINT” aircraft. If you’re interested, here’s a good link:
http://fas.org/irp/program/collect/rivet_joint.htm
I’ll check it out, I remember looking up that plane in my AFJROTC days back in HS, I do miss the SR-2 Blackbird I saw that plane fly one time, it was ahead of its time.