In a manner of speaking, we already do have two KH-12's on the ground. The two telescope optical assemblies that were donated by NRO to NASA (https://en.wikipe

In a manner of speaking, we already do have two KH-12's on the ground. The two telescope optical assemblies that were donated by NRO to NASA (https://en.wikipedia.org/wiki/2012_National_Reconnaissance_Office_space_telescope_donation_to_NASA https://en.wikipedia.org/wiki/2012_National_Reconnaissance_O...) are generally believed to be from the FIA, an ambitious satellite series that was originally planned to succeed the KH-11 line. But the optical side of the FIA had huge cost and schedule over-runs, and the simplified KH-12 was adopted instead. But note, the FIA telescopes were optimized for wide-area coverage, not for high resolution, so they wouldn't be ideal. ;-)