Entrance to the command post D-1 of the Minuteman II Missile National Historic Site, South Dakota, USA:Quinn Cottonwood

Entrance to the command post D-1 of the Minuteman II Missile National Historic Site, South Dakota, USA

Entrance to the command post D-1 of the Minuteman II Missile National Historic Site, South Dakota, USA: Use of deadly force authorized

Security camera at the entrance to D-1, the Minuteman II Missile control center near Badlands National Park in South Dakota, USA

Crew room with bunk beds at the Minuteman II Missile National Historic Site, South Dakota, USA

Telephone bank of the 1960's in the guard house of the Minuteman II Missile National Historic Site, South Dakota, USA

A Minuteman II rocket blasts through the flag of the former Soviet Union. This picture was painted on a wall 30 ft below ground in the command bunker of the Minimuteman Missile site Delta-01 in South Dakota, USA

Minuteman Missile National Historic Site, South Dakota, USA The outside of the blast door that leads to the control room is painted with a Domino's Pizza - alike painting reading: World-wide delivery in 30 minutes or less or your next one is free

Blast door to the control room of Minuteman Missile National Historic Site, South Dakota, USA

The inner command post of the Minuteman II Missile Site bunker is mounted on 4 huge shock absorbers inside a shell of hardened steel and concrete

Minuteman Missile National Historic Site, South Dakota, USA; The red box, secured by 2 locks, contained 2 keys and launch codes that were needed simultaneously to launch the nuclear missiles

Switchboard in the command bunker of the Minuteman Missile National Historic Site, South Dakota, USA

Vintage telex machine at Minuteman Missile National Historic Site, South Dakota, USA

Commander's chair inside the bunker of Minuteman Missile National Historic Site, South Dakota, USA

A NPS Park Ranger as tour guide at Minuteman Missile National Historic Site, South Dakota, USA

Control panel with one of the two key locks that had to be switched simultaneously for a missile launch

Panel, signal, launch enable control group SB-2492A/GSW-1- manufactured by the Boeing Company at Minuteman Missile National Historic Site, South Dakota, USA

Commander's launch control panel at the Minuteman II Missile National Historic Site, South Dakota, USA

Control panel for the 10 missiles at Delta 1 Minuteman Missile National Historic Site, SOuth Dakota, USA

Control panels for the analog guidance computer at the Delta-1 command post of Minuteman II Missile National Historic Site, South Dakota, USA

The launch facility Delta-09 of the Minuteman II Missile National Historic Site, South Dakota, USA

The launch facility Delta-09 of the Minuteman II Missile National Historic Site with cows grazing in the background, South Dakota, USA

Launch facility Delta-09 of the Minuteman II Missile National Historic Site, South Dakota, USA.