I doubt it; the US is, actually, one of the cleanest countries in the world, and that goes for our military bases, too. There are some that are cleaner than us, but not many. (And add in that our HYGIENE tends to be remarkably high compared even to Europe, due to having built our infrastructure and culture with more modern standards in mind, and we really come out smelling, not like a rose, but like soap.)
Not denigrating anybody else, mind, nor saying everybody is dirty. Just pointing out that, on a comparative scale, vilifying the US for being a filthy polluter is pretty unfair. (Especially compared to something far bigger that's pretty close to Korea: China.)