So far the Rapid Reaction forces and the Spearhead forces are coming from a number of countries, it is NATO, a 28 nation alliance.
It is unlikely that we will again have 550,000 men in Europe like Reagan did, unless of course, we don't stand up to Russia and we allow them put the world under threat again.
What?
Where will the treasure (and blood) come from that will be needed to entangle ourselves in centuries old European conflicts?