I was raised in the same town as this...
https://en.wikipedia.org/wiki/Montauk_Air_Force_StationCamp Hero. It is a state park now and you can go walk around and see the radar facility. Unfortunately they tore down 75% of the base's structures when it became a park.
As a kid I was fascinated by the huge rotating dish, which was operated even after decommissioning by a private company into the early 1980's.
It was originally part of the S.A.G.E. system under control by NORAD.
Once the place was finally shut down it became a favorite place to go for exploration while dirt biking. Later in life it became a favorite place to party. I had several inebriated dares out to the end of the catwalk in the cone. Looking back on it it is a wonder I'm still alive. After several unfortunate falls by drunken kids they stationed the Park Police headquarters on site. Which meant there was a slight possibility of getting caught. That didn't stop me either.
Anyways it was the start of my interest in this historical period. Now that I'm older it's more interesting in its history than as a party spot.
Many of the Nike sites were tied into SAGE over the years until the Nike program got shut down.
Overall it was a huge system with so many bases in the US as well as Greenland, Canada, Norway and elsewhere. There's so much to learn about it. I recently learned of Texas Tower 4 which I was shocked to not know about considering where I'm from. Gary_in_NJ might find it interesting as well. Google it.