What VG, what X-37B? Just see imagination flying high after reading the words "operate in space" :-)
In reality, the roots of these words are back in 80's when F-15 was an experimental platform for ASAT and "symmetrically" one of modifications of MiG-31 was developed for a similar purpose in SU. Just a platform, "space" was a business of a missile. Tons of publications on that subject on the Net.
Thus, nothing really challenging. Sounds like 40 y.o. technologies would be taken from the shelf (full of dust) and a little bit updated.