They will only need one dust buster (high powered

) for him. Bridge sections needed for ravines/highly undulated surfaces/unloading from ships, whatever. I'm not a military engineer-just guessing.
Looks like they mean business, though specially if you see the defence linkys at the bottom of Yahoo page. These manuevers cost serious money. They'd not be doing it unless something's cooking.
I'm gonna check with some folks in I know in Washington DC to confirm.
But remember the old saying: "No smoke without fire". (EP- not talking of cigarettes.)