On Sunday morning, December 7, 1941 America's naval base in Pearl Harbor, Hawaii was attacked by aircraft and submarines of the Imperial Japanese Navy.
In 1942, the government erected a scaffolding in anticipation of an air attack by German Luftwaffe and later by Japanese Air Force.
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The only aircraft powered by the Ha-70 was the Yokosuka R2Y, an Imperial Japanese Navy Air Service (IJNAS) prototype reconnaissance aircraft that was designed and built near the end of World War II.
The carrier battles in 1942, particularly Midway, had inflicted irreparable damage on the Imperial Japanese Navy Air Service (IJNAS), such that they could no longer put together a large number of fleet carriers with well-trained aircrews.
Kisarazu Air Field was originally established in 1936 as a base for the Imperial Japanese Navy Air Service, subordinate to the Yokosuka Naval District.
This is quite unlike the Japanese kamikaze attacks against Allied ships in the Pacific Theatre, in which Japanese forces loaded their pilots' aircraft with explosives, most often within the structure of the aircraft, and therefore had no chance of survival, as the explosives detonated with the crash of the aircraft itself - purpose-designed into the nose of the dedicated Ohka rocket-powered suicide aircraft.
In 1930, the Imperial Japanese Navy Air Service's basic seaplane trainer was the Yokosuka K1Y or Type 13 Seaplane Trainer, which had been in use from 1925, and it instructed the First Naval Air Technical Arsenal based at Yokosuka to design a replacement.