Also, the science update website Interesting Engineering says DARPA is working with the National Aeronautics and Space Administration.

Source: https://technology.inquirer.net/127101/darpa-study-explores-how-to-live-on-the-moon-as-nasa-fears-chinese-takeover

For nuclear missile propulsion, the space agency will collaborate with the US military research group DARPA, which has been working on a nuclear fission-based engine for some time.

Source: https://houstonianonline.com/nasa-will-test-nuclear-propulsion-in-space-to-travel-faster-to-mars/

Her earlier career includes stints as science director at the U.S. Office of Naval Research (Global) and as a technical consultant at the Defense Advanced Research Projects Agency (DARPA).

Source: https://techcrunch.com/2023/02/14/how-to-turn-lab-research-into-viable-business-techcrunch-early-stage-2023/

In coordination with Marine Corps Base Hawaii, DARPA is also partnering with the University of Hawaii and U.S. Geological Survey St. Petersburg Coastal and Marine Science Center to tackle this complex, five-year project.

Source: https://www.dvidshub.net/news/448027/reefense-project-commences-off-mcbhs-coast