You say "equivalent salary" but compared to what? You mentioned FAANG above so I assume that? Unless you're ignoring total compensation, that's not right. You're going to have a much lower base compensation at CIA labs than FAANG. The $150k extra might only match FAANG, and would probably take years of effort to get it at the CIA.

I imagine if you're talented enough to work at CIA labs you could land a much more lucrative and guaranteed FAANG compensation package instead.