Drones?
What does this look like to you? Drones? That was the first thing that came to my mind, but they're actually helicopters. Or I think they are helicopters. I first heard them, then saw them and by the time I got this shot they were almost out of range to get a good picture. I think they're awesome. Just don't know what they are. Anyone know?
Those are V-22 Osprey tiltrotor aircraft. Used by the US Marines, out of Kaneohe Bay, Oahu.