Yes, obviously the US is a massive Imperialist power. I don't want it to have those bases, or nuclear weapons, or even a military or government at all, but I sure as hell don't want it to be replaced by an openly autocratic imperialist power that also has all those things anyways, which is what Russia is aspiring to be under Putin.
But that is a completely orthogonal discussion as to whether Force is required to stop malicious actors from imposing their will on others through violent Force themselves. That is, as an anarchist, a basic requirement of human interaction; self defense and defense of others.