[Flash Bazbeaux]

But I never saw TK.

Well, Wikipedia has it

The original TALENT compartment was created in the mid-1950s for the U-2. In 1960, it was broadened to cover all national aerial reconnaissance and the KEYHOLE compartment was created for satellite intelligence.

[Alas Babylon!]

When I was in, even SAYING Talent Keyhole outside of the SCIF could get you arrested!

I had an airman who did so, and he got an Article 15.