Nuclear bases in Eastern Russia are all built with though of stopping, and stalling a substantial military assault from paratroopers, sabotage specialists battalions, or forward armed recon that might preclude a full scale conflict, but security was known to be lax (thought still way above any normal base)
And in US it seems, they are more wary of infiltration by small force, or "trickery," or, I'll give myself liberty to imagine, enemies from within.
Regarding nuclear facilities, that reminds me of story on juridiction between an US Marshal and the security personnel of nuclear facility.
http://www.funraniumlabs.com/2018/09/the-fringes-of-regulati...