Last I heard it was at the National Defense Command Center in Abilene, TX a day or so ago, and today flew to Offut AFB.
Home of STRATCOM and Space Command.
Incidentally, the DNI today added SpaceCom as an Intelligence Agency.
I could be wrong, but I don’t think there is a National Defense Command Center at Abilene. But they can fly that Nightwatch plane there (or anywhere), and it can become one.