Apparently Aerojet is getting into the responsive reusable engine business (albeit with Air Force funding). I think that’s great, but I have to wonder if the reporter has been paying attention to what has been going on in the industry:
The last US-designed and produced hydrocarbon engine was the Rocketdyne RS-27, based on 1960s technology and now out of production.
There may be some qualifying adjectives that would make that statement true (of thrust greater than X? Used in an orbital launch system?), but folks like XCOR and Armadillo, and Masten, and several contenders for the LLC would be surprised to learn that they haven’t been designing and producing hydrocarbon engines for the past few years.