Pfff. The point isn't to service any military need, because there is no military need. It's to provide a fig leaf for government spending which the lunatic fringe of the Republican Party wouldn't object to. If the Pentagon cut it's budget to a sensible level without a similar amount of government money being dumped into other projects then the US economy would collapse in a huge wave of layoffs amongst the 3-4 million people who's jobs are supported by military production.
Just like pretty much all arms manufacturing in any economy outside of wartime really - the trash being produced by the British industry is an equally useless stealth jobs program, too. That's why we end up with super-expensive ships and aircraft that are typically inferior to their cold war equivalents.