Rob, the triangles are military auxiliary emergency landing fields, Luke Air Force base in the western suburbs, is one of the largest fighter aircraft training bases in the US. There's another triangular landing field just south of Gila Bend in the Barry Goldwater Gunnery Range. As far as the other facility, I'm afraid that I'm not familiar at all with that area .There's alot of unusual things out here, if you're a car fanatic, you would have a field day with all the auto manufacturers hot weather testing that's done here, I've seen cars that I have never seen before , or since, all with auto manufacturer license plates from Michigan.