Rotation Detonation Engines emerge fron DARPA

https://www.sandboxx.us/blog/darpas-new-missile-hints-at-truly-game-changing-technology/

sample quote

A rotating detonation engine takes this concept to the next level. Rather than having the detonation wave travel out the back of the aircraft as propulsion, it travels around a circular channel within the engine itself.

Fuel and oxidizers are added to the channel through small holes, which are then struck and ignited by the rapidly circling detonation wave. The result is an engine that produces continuous thrust, rather than thrust in pulses, while still offering the improved efficiency of a detonation engine. Many rotation detonation engines have more than one detonation wave circling the chamber at the same time.

As Trimble explains, RDEs see pressure increase during detonation, whereas traditional jet engines see a total pressure loss during combustion, offering greater efficiency. In fact, rotation detonation engines are even more efficient than pulse detonation engines, which need the combustion chamber to be purged and refilled for each pulse.

end quote

Interesting. Thanks for sharing

I used to live very close to Edwards Air Force base and can remember hearing about Pulse jet technology in the late 1980s and early 1990s, our country was working on developing those type of engines to be used in very high-altitude spy planes which back then were call "Aurora" spy planes.
I believe that program got drop in favor of satellite spying

Not the first detonation engine powered USA weapon.

https://airandspace.si.edu/stories/editorial/buzz-bomb-70th-anniversary-v-1-campaign

sample quote

The V-1 (Buzz Bomb of Germany) had an interesting afterlife in the United States.
In a rare American example of outright copying, the Army Air Forces and the Navy decided to mass produce a version for the attack on Japan.
By the end of 1944, the first copy,
which went by the AAF designation JB-2 (Jet Bomb 2) was launched from Eglin Field in Florida out over the Gulf of Mexico.
After World War II suddenly ended in August 1945, mass production was stopped, but the U.S. Navy continued to use its version, called the Loon,
to gain experience with firing missiles from ships and submarines. It was a precursor to larger, nuclear-armed cruise missiles like the Regulus the Navy deployed in the 1950s.

the relationship between a V2 and the Rotation Detonation Engine is like the Model T to a C8 Corvette.