Lieutenant Nagai, Tsuyoshi
Nagai was the commander of the 3rd Torpedo Attack Unit, Nakajima B5N2 Kates from Soryu, intended to hit the aircraft carriers they expected to find moored off the north west of Ford Island. One of his flight made Lieutenant Matsamura (Matsumura, Hirata) angry when he torpedoed the target ship Utah. Nagai left the lesser ships alongside Ford Island and looked for an alternative target. He selected the paired Oglala and Helena at Ten Ten Pier. His torpedo passed under the shallow-draught Oglala and struck Helena. The latter suffered from the direct hit, but was not hit again and survived. Oglala had a wooden hull which cracked and she capsized.
You can find out more about Japanese Attack Units in the following Osprey books: