Sikorsky Blackhawk helicopters

So Bell and Boeing developed the tilt rotor, so you can operate in helicopter mode with the rotors up, or you can tilt the rotors forward to have a propeller going around like a regular aircraft. These can go about 300, 350 miles an hour. They also don't make as much noise as a helicopter blade running this way, as opposed to a propeller running this way. So they can't hear you coming, and you're coming at 350 miles an hour, not 200 miles an hour. The Marines consider this a significant advantage. They did use one in getting Osama bin Laden, although most of them were Sikorsky Blackhawks. I'll tell you some more about Blackhawks later.