 On May 11, the Imperial Japanese Navy carried out a massive kamikaze mission called "Kikusui Rokugi Sakusen" (Operation Kikusui "Floating Chrysanthemums" No.6).On the early morning, pilots of the Tokkōtai suicide squadrons took off from their bases; among those pilots, there was Kiyoshi Ogawa, a member of the Dai-nana Showa-tai Squadron, flying a Zero, modified to carry a 250 kg (550 pound) bomb underneath the fuselage.