No, we cannot "go it alone" insofar as we have zero support from anyone. We do not need military troops from nations, but we do need basing privileges. If you think otherwise, maybe you should talk to some people in our military. If you recall, we did not "go it alone" in Afghanistan. The first thing Bush did was to get SUPPORT from Uzbekistan, Turkmenistan, and Pakistan, because we NEEDED THEIR BASES---their geography. Without that, everyone pretty well agreed that we could not have "invaded" Afghanistan successfully. And if you recall, it took more than a MONTH to get even those three "allies" in place to do what we needed.
It is a reality of life that, barring indiscriminate nuking of nations (which is simply ridiculous), we can no longer operate militarily alone in certain parts of the world.