And as long as it is soldiers ( both male and female ) will be needed.
Since the beginning of this century there are more and more people voicing against armed forces of any country, sating that they are nothing more than bloodthirsty killers and tax spenders.
But let's be realistic - those same people would be the first one to ask for military protection in case of foreign attacks. When someone is out there to kill you and your entire family/town/nation ( and giving the nature of this world and us Humans there are indeed plentiful people like these ) you will indeed need those bloodthirsty killers and tax spenders to save your life.
And this gig for all countries and nations on Earth, not just USA.