Seems like a moot point. Now that Marxist-Leninism and "national liberation" ideologies have gone out of fashion in the Third World, I don't expect a "Red Dawn"-style invasion to occur anytime soon. The Islamists, the current threat to the West, tend to "invade" by emigrating to Western countries, using their high birth rates to pop out lots of kids who get raised on jihadist propaganda, and then sending them off to bomb subways.
That's what "invasions" are like nowadays; you're fighting against the demographics of your country's population, not guys in uniforms riding in BMPs and Mi-24s.
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