The US isn't
PURE capitalism. no one claims they are - and nothing about capitalism dictates that
EVERYTHING has to be "private". But the US is absolutely a capitalist country.
Military? not socialism. Neither are police or fire departments. so "but military" doesn't carry any real point.
And those countries? still aren't socialists countries. The US not having "private military" doesn't change that.
This isn't "black and white". This is "socialism is failure based on 100+ years of historical evidence". This is logic and evidence. As I said, those are capitalist countries with strong welfare policies. This is also basic definition of socialism which isn't "the government does stuff".