I found a really weird looking siren, that shows up as "mystery thing" on the Nebraska siren map. It does seem to have a chopper, so I'm wondering what this siren is: https://earth.google.com/web/@41.49772204,-102.62096105,1067.23730469a,0d,15y,125.48120503h,99.24635731t,0r/data=IhoKFlZDbk...