Thank you for agreeing with my point.You didn't answer the question. Where in Title 50 is the term "federal installation" defined? I'll answer it for you. There is no definition for the made-up term "federal installation." It is a generic made up term. The sign sites the Statute, 18 USC 930. The installation is, as defined in 18 USC 930, a "federal facility."
But does federal installation mean the entire base? Who knows, it's not defined.
I'm not sure why you're arguing against my agreement, but... hell, it's OCDO, and you and solus wouldn't have anything else to do if you didn't fight allies.