As only the US Marines do it, like the Bad Asses that they are.I'm trying to figure out how that conversation went in the morning preflight..."Hey Colonel, mind if we take a Helo up today and tour the St Louis Arch?"Flight officer: "Sure. No prob. See ya when ya get back."" Ah Sir, One more thing...mind if we hang a Platoon of Marines from a rope underneath that Helo during the flight?"Flight Officer: "I said Okay. Now get out of my office."US Marines.