https://spacenews.com/darpa-says-decreasing-launch-costs-new-analysis-led-it-to-cancel-draco-nuclear-propulsion-project/
>A second factor, he said, was a later analysis that favored an alternative technology, nuclear electric propulsion (NEP). That uses a nuclear reactor to generate electricity to power an electric propulsion system. NEP offers far higher efficiencies that NTP, which itself is more efficient than chemical propulsion systems, but with significantly less thrust.
>“Nuclear electric is probably a more optimal long-term solution,” he said, both for scientific exploration and national security applications. “That power in the space domain may be the critical enabler as much as the propulsion efficiency.”

Looks like the NTP holdouts finally surrendered, NEP bros keep winning.