Service History
The submarine was laid down on 7 January 1939 at the Kawasaki shipyard, Kobe, and launched on 24 February 1940. On 15 July 1941 she was completed, commissioned and assigned to Submarine Squadron 1's Submarine Division 3 in the Sixth Fleet. I-21 was based in the Yokosuka Naval District.
On 31 October 1941 Commander Matsumura Kanji was assigned as Commanding Officer, and on 10 November he attended a meeting of submarine commanders aboard the light cruiser Katori, convened by Vice Admiral Mitsumi Shimizu, to be briefed on the planned attack on Pearl Harbor.
Read more about this topic: Japanese Submarine I-21
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