Everyone is dumbfounded at the size of the American logistical tail. Remember the "cake" scene from "Battle of the Bulge. Even if not entirely true, it was pretty close. The Germans almost overran the map warehouse for First Army. There were something like one and a half million maps there.
Well, part of the logistical size is dictated by the fact that everything for our fighting troops has to be transported over the ocean, so of course our "tail" is the biggest.
But part of it goes to the "cake scene." We provided our troops with all that stuff because we could. And yes, Prime Minister, we do eat more meat than you. Because we like it and because we can.