Here's an interesting article on the history of the plant. Sounds like employment peaked in 1966 with 17 thousand employees before dropping to 7500 in 1972 and staying roughly stable until the 90s. Apparently they've been building radar there since 1987, and I can confirm that's still the purpose of the Lockheed-Martin plant.
https://www.syracuse.com/living/2019/09/an-historical-timeli...