And how would an American soldier have the opportunity to do the same if they were not afforded the same opportunity?

I can literally cite two (recently) living examples of this: Mike Prysner and Aaron Bushnell.

One gave up a military career entirely after being deployed to Iraq once and dedicates his life to anti-war/ anti-imperialist activism to the point that he literally gatecrashes conventions that host his former commander-in-chief Bush Jr. to call him a mass murdering war criminal right in his face.

The other, was an active US soldier who became disillusioned with the Imperialist war machine after seeing the US help Israel carry out a livestreamed genocide for over a year, so much so that he wrote a manifesto disavowing his military associates and condemning the entire imperialist system and everyone that supports it, and shortly after decided to (regretfully) self-immolate in front of the Israeli embassy.

That in my opinion, should be the standard that all potential revolutionaries in the US military should follow. And DEFINITELY NOT someone like Graham Platner who hasn't done a smidgen of what the former soldiers I just mentioned have done.