What are these FAA facilities in Seattle doing?
Seattle’s &quot;golf ball&quot; in Discovery Park was once part of the country’s Nike Hercules air defense system of missiles and radars in the 1950s. While most of the structures have been torn down, this golf ball still stands as a relic of the Cold War.
Discovery Park used to have an array of radars at its peak. It was a Nike Ajax air defense site in 1953 before becoming an Air Force command center for the Nike Hercules system. The remaining radome was built in 1959. It is not currently in use.


https://blog.seattlepi.com/thebigblog/2013/04/09/what-is-that-giant-golf-ball-in-seattle-sky/#photo-226558


Initially assigned a Permanent ID of RP-1 and later a Sage ID of Z-1. Abandoned by the Air Force in 1963 and turned over to the FAA, now known as Fort Lawton FAA Radar Site.


https://seattlediscoverypark.org/faa-tower/

More information:

https://en.wikipedia.org/wiki/Project_Nike