Sixth-grade teacher Shizu Higa was pouring a second helping of milk into a student’s cup when the classroom was shaken violently and the sound of an explosion was heard.

“Get down!” Higa shouted.

On June 30, 1959, a U.S. Air Force jet based at Kadena Air Base in Okinawa Prefecture crashed into a residential district in the former city of Ishikawa — now part of Uruma — and exploded. Fragments of the aircraft tore into Miyamori Elementary School.