DARPA at least isn't doing nuclear-propulsion anymore, having been halted for awhile. They believe that propulsion can be done chemically for the immediate missions they want to do; with aid from Hall Thrusters between LEO and MEO. DRACO was always kind of drastic for Earth-orbit tugs.
I don't know how this affects General Atomics. For long-reaching probes, nuclear-electric is fine. And fusion is coming.
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