Project Blue Book Case #1684. On July 27, 1952, a bright object was observed over Wichita Falls, Texas — home to Sheppard Air Force Base, one of the largest technical training installations in the Air Force. Sheppard trained aircraft mechanics, electronics specialists, and other technical personnel critical to keeping the Air Force operational.
July 27, 1952, was during the most intense week of the great wave — the same night as the second round of the Washington, D.C., radar events that would prompt the Pentagon's largest press conference since World War II. Reports were pouring in from across the country at a rate that overwhelmed Blue Book's tiny staff.
Wichita Falls sits in north-central Texas near the Oklahoma border, in terrain that transitions from the Cross Timbers woodlands to the western prairies. Sheppard AFB's training mission generated significant air traffic from trainer aircraft, but the base also hosted operational units. The object observed over the city did not match any Sheppard operations or visiting aircraft.
The simultaneous occurrence of unknowns across the country during this peak week — Washington, Wichita Falls, and dozens of other locations — suggested either a genuine, widespread phenomenon or a mass psychological event. Blue Book's Captain Ruppelt documented these peak-wave cases as among the most challenging of his tenure.
No conventional explanation was found. The case was classified "Unknown."