I was just at an airshow at Miramar MCAS in SoCal a few weeks back.
The Harrier is the LOUDEST jet you EVER heard. It's several times louder than any of the other jets I heard at the show. You just about have to cover your ears, and you can't hear anything else at all. The thing makes a SCREAMING noise within a half mile of you.
I roger that. I remember being in a Huey circling above the LHA-1 Tarawa a few miles off the Pendleton coast during Gallant Eagle '81; we were waiting for a flight of four Harriers to take off so we could land. We were at least a couple of thousand feet above the water, and those jump-jets sounded like they were just outside the open hatch.