A night-time test at our test facility of high-speed, hot hydrogen flowing in at around 1700 ft/sec (Mach 0.2) and 1500 degrees Fahrenheit to burn with liquid oxygen at extremely low combustion pressures. The test simulates after-burning of hydrogen exhaust from a future nuclear rocket engine – one of (88) hot-fire tests we have successfully run in support of NASA’s nuclear thermal propulsion program for technology demonstration. This work completes Phase I and Phase II efforts led by RPS in 2019-2022. RPS is looking forward to further explore this high-speed combustion technology as dual use for future hypersonic burners and new generation industrial combustors for fighting climate change.