Nope, not on private property, especially when it's his private property. Besides he's the President, he wears 'em when he wants to....Or when the Marine Sergent on the chopper tells him to, I would imagine.
Actually, they are probably sitting still in that picture, when they certainly don't need 'em, especially in that hunk of Detroit Iron, unless somebody comes up and rear ends them in a Mack, they should be OK. Even the SS suburbans probably wouldn't intimidate that beast. I don't though that I've seen it close up enough from the proper angles but I bet it's a Diesel and a Dualee wouldn't surprise me either, although in the "waiting for the chopper" picture, it doesn't appear to be.