At the height of the Cold War, the United States deployed thousands of Intercontinental Ballistic Missiles (ICBM) in a network of underground complexes across the American landscape. These nuclear weapons made up one part of America’s vast deterrent force as it faced off against its ideological rival, the Soviet Union, until its collapse in 1992. And as the Cold War itself has faded from memory, so too have the lessons and fears these weapons once elicited in the general public. Yet the issue of unchecked nuclear proliferation has returned that fear to the forefront.

With much of America’s Cold War-era nuclear arsenal deactivated and dismantled today, there are a growing number of former missile sites whose mission is to preserve the history and memory of the period. These frozen time capsules are open to the public, catering to an array of nostalgic “nuclear tourists.” As “Shrines to an Armageddon,” they preserve the dramatic vestiges of a power that can destroy the world. The sites stand sentinel as potent reminders of American military might, but also serve as a cautionary tale for future generations.

Two such sites, the Minuteman Missile National Historic Site in South Dakota and the Titan Missile Museum in Arizona, are the only remaining ICBM sites in the United States that not only allow visitors into the underground launch control center, but also to come face to face with a (nonfunctioning) intercontinental ballistic missile as well.

The project’s title refers to the Air Force’s mandatory two-person buddy system in place at all ICBM sites. This applied both to the on-duty officers on 24-hour alert in the launch control center and to the work crews tasked with maintaining the missiles. The policy was intended as a safety precaution and as a safeguard against potential sabotage. The images pair America’s most prolific ICBM (the Minuteman II) with its most powerful (the Titan II) and offer a calculated look at the nuts and bolts of Mutually Assured Destruction, the mad logic behind nuclear deterrence.