This navy dispatch announces the attack on the U.S. Naval Base at Pearl Harbor, Hawaii by the Japanese Navy. It was received at the Squantum Naval Reserve Aviation Base on December 7, 1941 from the First Naval District. It states, “AIR RAID ON PEARL HARBOR X THIS IS NOT DRILL.”

Source: “”˜This Is Not a Drill”™ Dispatch.” 7 Dec. 1941. National Archives Identifier: 596244; Other Identifier: 06339* https://catalog.archives.gov/id/596244