Quote from dcvtss:
Millions of men but how are they going to get to the US? How will they be re-supplied? Wars are more about logistics than tactics...millions of men on boats is what is called a target rich environment, there is nowhere in the sea that a troop ship can be hidden with modern satellites looking down. Of course satellites can be shot down but that is a drastic escalation that in all likelihood would lead to nuclear exchanges as one or both sides felt like they could get blindsided and get into a use it or lose it mentality.