I'm assuming this is all pretty well classified, but I would be shocked if the US government hasn't had the ability to do that for a long time. Consider that back in 2012, the National Reconnaissance Office donated two surplus telescopes to NASA that were substantially better than the Hubble telescope. If those are the sort of telescopes that the government has no need of anymore, imagine what the state-of-the-art is!
As an aside, that donation has actually put NASA in a bit of a bind. For political reasons they can't very well turn down the offer. But the telescope itself is only about one third of the total cost of space telescope, with the rest being due to the cost of the instruments and the launch itself. Unlike the US military, NASA does not have an unlimited budget so this unexpected expense threw a wrench into their long-term plans. Furthermore, the telescopes were designed to look down instead of up, so they're not optimized for astronomical observations.