While advances in rocketry have been pretty minimal on the last few generations (see: Sprint), some other technologies seem to be actually proceeding. One is the railgun. Electromagnetic cannon have been around for 80 years or so, but it’s finally starting to look like militarily useful electromagnetic cannon might soon be practical realities. The Navy is very interested; while a railgun would be incredibly impractical for Army artillery, the Navy could easily pack all the secondary system needed within the confines of a ships hull. Muzzle speeds of a dozen kilometers per second or so would allow both long ranges and high altitudes. If the accuracy can be made good enough and the firing rate high enough, a railgun system could be adequate for anti-missile use.
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