DARPA Space-Bound Nuclear Thermal Engine to Fly on Demo Rocket in 2026

https://www.autoevolution.com/news/darpa-space-bound-nuclear-thermal-engine-to-fly-on-demo-rocket-in-2026-188337.html

DARPA Seeks Funding for Next Phase of Hypersonic Weapon

https://www.c4isrnet.com/battlefield-tech/2022/05/09/darpa-maturing-scramjet-powered-hypersonic-weapon-concept-through-follow-on-program/

New DARPA Hypersonic Missile Prototype Test Flew 5x the Speed of Sound

https://www.tweaktown.com/news/86049/new-darpa-hypersonic-missile-prototype-test-flew-5x-the-speed-of-sound/index.html