Project Blue Book Case #11551. On March 24, 1967, witnesses near Belt, Montana — a tiny community approximately 20 miles east of Great Falls — observed a bright object in the sky. Belt's significance lay in its position within the Malmstrom Air Force Base Minuteman ICBM complex, where hundreds of nuclear-armed intercontinental ballistic missiles were deployed in underground silos across the Montana prairie.
Malmstrom's missile field covered thousands of square miles of central Montana ranchland. The scattered Launch Control Centers and silos that constituted America's land-based nuclear deterrent were connected by a web of access roads and communications cables. Any unidentified aerial object over this landscape was a matter of the highest national security concern.
March 1967 is historically significant in the Malmstrom UFO story. While this specific case predates the most famous Malmstrom UFO incident — the alleged March 1967 shutdown of Minuteman missiles at Oscar Flight (a story that gained prominence decades later through witness testimony) — the timing and location place it in the same geographic and temporal context.
The object could not be identified. The case was classified "Unknown" — a profoundly unsettling designation over the nation's nuclear missile fields.