Nkc-135
All were old hand-me-down tankers from SAC, renamed NKC-135, meaning they could not be restored to their original configuration.
We had an NKC-135 at a bare base for the afghanistan show of force. Don't know what they did and they were only there a couple of weeks before they disappeared in the night. Their crew stuck to themselves and I remember them wearing black flightsuits. Hush-hush-world I'm sure. Strange nose gained a lot of looks from us tanker choads.