I am fully in favor of the US reducing its military. Sadly, fascists, racist and religious fundamentalists won't stop violating the rights of other people, fueling the American military industrial complex.
On the other hand, defending Taiwan and Ukraine and Kuwait (the first gulf war, while motivated by oil interests there was a clear humanitarian principle too) are pretty honourable IMO.
I would definitely not want to see China or Russia as the major world power. The US is not perfect but it's not the worst either.