Undoubtedly, the implemented technologies in the military field will sooner or later be used in the field of civilian. Of course, hypersonic transcontinental flights are still far away, but a compact nuclear reactor will most likely find its application, for example, in space.
Meanwhile, in Russia, the combustion chamber of the most efficient oxygen-kerosene liquid jet engine RD-0124 has been successfully tested. The peculiarity of the camera is that it, like the mixing head, is made by means of 3D printing. This method reduces the time and cost of production by 20%.