Considering that some individual NRO launches have had budgetary costs of $900m to $1.1bn for a single satellite and launch vehicle, it would be fascinating to know what kind of technology they're dealing with today. Lots of rumors about KH-11s and Misty, not much concrete info, for obvious reasons (it's all TS and codeword and higher).
https://en.wikipedia.org/wiki/KH-11_Kennen
A few years back an unused mirror assembly that was near identical to Hubble was declassified.
https://www.americaspace.com/2012/06/06/top-secret-kh-11-spy...