Projecting our power over 5,000 miles, crossing an ocean, would face difficulties. The supply line would not go unchallenged. Missile and drone attacks would take a toll.Not many difficulties. We have plenty of experience doing this. Maybe you have no clue what the US Army is - it's the number one logistics company in the world. Those of us in combat arms is barely 1/8 of the Army, everyone else is there to support us. 7/8 of us is just beans and bullet delivery.
I mean contested logistics in a WW3 scenario. I doubt the Army is suddenly going to sprout a Navy. Trying to deliver supplies while Russia or China is trying to stop you differs from uncontested logistics.
Does the Army have a fleet of combat warships to transport about a million men and equipment without being sunk? What does an Army transport ship do when an enemy warship or submarine shows up?
Links only due to source, Army Times and Defense News.
Army ships aren’t going to be running through highly contested waters, and they’ll very likely have some kind of escort anywhere they go that has a chance of enemy contact.
Neither Russia nor China have any kind of power projection. I’ve already mentioned Russia’s carrier. China’s are barely more useful, they have no blue water operations experience, no ewacs, no nukes, not much group integration (especially asw). China’s carriers would be hiding in dock in any real conflict. Russia’s isn’t even worth wasting a 500 pounder on.
A small threat would be submarines, but as I’ve mentioned, their stuff isn’t as good as ours, and we know where all of theirs are.
The only real maybe threat is land-based missile/drone saturation attacks on near-shore operations. That’d be about it.