[IYAS9YAS]

With you. . .also, what is this “US Air Force KC-767 tanker aircraft” they are referring to?

Not sure. When I was in the Air Force, we had KC-10s (based on the DC 10) and KC-135s (based on the 707).

I know other branches also use helicopters, C-130s and a smattering of other fixed wings (can't recall them at the moment).

[ASOC]

The KC-767s mentioned are part of the 'secret fleet' of 4 KC-767s used to refuel the RS-90 (AKA the Aurora) - the recce bird runs on super-cooled hydrogen rather than "liquid methane" as reported earlier. This requires special tankage and equipment to safely transfer the near liquid H2 to the aircraft in mid-air.

The new X-37B (see more here) and the recent successful testing will likely spell the end of the RS-90 program - for costs if nothing else.

As I write this, a second "X"-37 is under construction.

What that programs final designation will be is up in the air, no pun here of course, but I would suggest XL-6 (Exoatmospheric - Load-carrying) and 5th of the series, with the ill-fated USAF (X-20A) Dyna-soar from 1963 as the XL-1.

The Prime, Asset, X-23, and X-24 programs would then be the XL-2 theu -5 respectfully. The old Dyna-MOWS (Manned Orbital Weapons System) falls outside of the space-recce meme.

And everyone is getting excited about a **possible** new Chinese J-20 fighter....... pshaw.