What you see in this image is an eight-ton metal door that opens (and closes) on the Delta-01 Launch Control Center 31 feet underground once operated by two missileers who controlled 10 Minuteman II missiles armed with nuclear warheads. According to the National Park Service, "Tony Gatlin, a Deputy Missile Combat Crew Commander, painted the pizza box in 1990. The pizza box is an adaptation of Domino's Pizza's tagline and is painted on the blastproof door of the Minuteman II Launch Control Center Delta-01." The "thirty minutes" is a reference to the time it would take for a nuclear missile fired from the Soviet Union to reach a point in the United States.