The USofA do not need to conduct real, large-scale, combined arms warfare. We are an island nation. We do not need to and should not plan to conduct real, large-scale, combined arms warfare. Only continental nations need that ability, at least in theory.
Theoretically, even if we -- The USofA -- had such an ability, against whom would we use it? Where, why, how? We could only use it on our own continent. And against whom? For what?
Theoretically, the only nations1 who need to be able to conduct real, large-scale, combined arms warfare today are continental nations. And given the state today of resources and industries, weapons and delivery systems, among continental nations, only the ones who already have that ability need it. And that means Russia, pretty much alone so far as I can see.
The USofA need ability to deter and, if need be, to throw off an invasion of her sovereign territory. Every island nation needs that ability and can have that ability if she is appropriately educated, resourced, industrialized, and patriotic, which is to say, fully armed with self-confidence.
Wittingly and unwittingly today, almost all the nations -- Israel, of course, is the exception2 -- have taken hold of the Five Principles3 of the Non-Aligned Movement and expanded them, from peaceful coexistence of nations without resort to treaty blocs to national communities of a common soteriological destiny. And that we see is not political-economic uniformity — Hegemonic Globalism — but rather spiritual-cultural efflorescence — Polyphonic Multi-Centrism.
Effectively for decades, nations of The Americas and The West Eurasian Peninsula renounce ability to conduct real, large-scale, combined arms warfare. Four of these are island nations: the combined nations of The Americas, Great Britain, Ireland, and New Zealand. The rest are continental nations.
Now none of these has culture that could or would reverse that renunciation. And why would they want to? The renunciation was proper. Their propaganda notwithstanding, these nations are content to let Russia be able to conduct real, large-scale, combined arms warfare while they focus on deterrence and territorial defense . . . or something.
Meanwhile, Russia has no grand designs on other nations' territories, never has had, never will, and everyone knows that to be true.
Thus self-signaling her delimited existence.
The Five Principles of the Non-Aligned Nations, as stated in the Sino–Indian Agreement of 1954, are:
mutual respect for each other's territorial integrity and sovereignty,
mutual non-aggression,
mutual non-interference in each other's internal affairs,
equality and co-operation for mutual benefit, and
peaceful co-existence.