Yes, but if you think the whole us army all the sudden landed on Great britain, France, Germany, Italy and Turkey pherhaps, with no warnings at all just like the Germans invaded Poland (They declared war, but already entered Poland after 2 hours or even less if im not wrong), they would have little chance to put up a proper defence. Of course USA would earn little to nothing from it as they would just loose alot of men later on when the armies gets organized and/or the state starts with guerilla warfare with what they have (unless they choose to shoot every civilian they see so no one is left alive). It pretty much goes to every army, no matter how big you are, these days a single civilian with AK 47 can take down 5 of your best troops before they know what hit them, so there is nearly no gain unless you are a corrupt politican that just want to fill your own pockets in cost of soldiers lives
