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Tourists walk through a blast door at the Delta 01-Launch Control Facility, the former control center of a Minuteman missile, just outside Wall, South Dakota, USA, 23 March 2015. After the missile site was deactivated in 1994, following the Strategic Arms Reduction Treaty signed by US President George H. W. Bush and Soviet leader Michael Gorbachev, the National Park Service turned the facility into the Minuteman Missile National Historic Site.