The Japanese Navy Carrier Striking Force, composed of four carriers and an escort of battleships and lesser ships, sortied from the Inland Sea of Japan for Midway Atoll. In the Aleutian Islands in northern Pacific Ocean, Japanese submarine I-9 launched her floatplane for a reconnaissance mission over Kiska. In Japan, the naval leadership instructed the various fleets and bases to prepare for a new radio encryption scheme that would be deployed very soon.
