I think it was an 80's comedy. Something about nuclear missiles or maybe the "star wars" anti-missile program. I seem to remember a scene where someone is taken to the secret underground military complex, where the surface building is disguised as an abandoned diner. They work the soda fountain machine to reveal the elevator. The elevator falls comically fast and absurdly deep into the earth, to get to the operations center. I think there was a scene where the top side buildings transformed into something like (maybe) solar reflectors in order to (maybe) shoot missiles or satellites down. My memory about this is very hazy.