Space Force establishes $35M institute for versatile propulsion and power at U-M
https://news.engin.umich.edu/2024/10/space-force-establishes-35m-institute-for-versatile-propulsion-and-power-at-u-m/
I saw this article earlier this year, maybe a possible solution to needing chemical propellent, a good match for nuclear powered spacecraft.
Art concept image of a propellantless propulsion drive. NASA Veteran's Propellantless Propulsion Drive That Physics Says Shouldn't Work Just Produced Enough Thrust to Overcome Earth's Gravity
https://thedebrief.org/nasa-veterans-propellantless-propulsion-drive-that-physics-says-shouldnt-work-just-produced-enough-thrust-to-defeat-earths-gravity/