Statement of Significance (as of designation - April 19, 1994):
At 7:02 a.m. on the morning of December 7, 1941, two U.S. Army technicians practicing with a new radar set detected the approach of a mass of aircraft. The pair reported their findings to the information center at Fort Shafter, where it was decided that the radar blip was a flight of Army B-17 bombers expected to arrive on the island that morning. The technicians continued to plot the incoming aircraft until 7:40 a.m., when the contact was lost in the background interference as the planes approached Oahu. Only after the men had secured their equipment and were headed back to their base did they realize the aircraft they had monitored were Japanese planes on their way to attack Pearl Harbor.