Actually it was an entirely different level of noise from Police helicopters.
I'm a lifetime L.A. resident, and have had the Police right over my house as recently as a couple weeks ago. I've lived in places where they were there just about every night in the summer, so I'm very familiar with it. This noise was several magnitudes greater. It had that "military" sound, similar to when they have a big bomber fly over - but it still sounded like propellers, so I was suprised at how loud it was. I then saw how many helicopters there were.
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