If we're assuming a nuclear war then the US military is comparable to a bunch of other militarys. And the "various geopolitical reasons", on examination, includes possible outcomes like the US being pummelled through the stone age and out the other side, or more mild ones like New York being flattened. It isn't really much of an option in any foreseeable scenario where their goose isn't already being cooked.

So yes they are scary, but they aren't that scary relatively speaking. We've left the brief era where the US could exert military supremacy over the globe and it is ambiguous who has the "best" military among the major powers [0]. Militarys are generally a tool for self-destruction anyway so the term is a bit ambiguous, most of the big empires fall because they get too enamoured with military solutions over economic and diplomatic excellence.

[0] Does the US military even perform to spec? There is clearly a lot of corruption and I've seen it described on HN as a disguised welfare program.