Gentlemen, you can’t fight in here! This is the War Room!
— President Merkin Muffley
Muffley was one of three characters played by Peter Sellers in Dr Strangelove, by Stanley Kubrick. The image is of the 25-ton blast door in the NORAD, Cheyenne Mountain, Colorado nuclear bunker. It is at main entrance with another blast door (background) beyond which the side tunnel branches into access tunnels to the main chambers, including presumably a real war room. And hopefully no President Muffley or Dr Strangelove!
Image: By USAF photo. [Public domain], via Wikimedia Commons