It achieves the purposes of US foreign policy going back nearly a century, plus the long term investments in a large part of the US military.
The bulk of the US Army exists for this very reason, to prevent or oppose international aggression in Europe. It was built and has been maintained on this scale for this this purpose.
American marxists and leftists love using the word "investment" to describe pissing-away incredible sums of taxpayer money on ridiculous social-engineering schemes, and funding their cronies and bloated political blocs.
think about it