 Complete the following phrase:  On 13 June 1944, Admiral Soemu Toyoda activated Operation A-GO for the defense of the Mariana Islands. Tone was assigned to Force C of Vice Admiral Jisaburo Ozawas Mobile Fleet, which proceeded through the Visayan Sea to the Philippine Sea headed towards Saipan. On 20 June, after the battleships , and carrier were attacked by aircraft from the carriers , and and the bulk of the Japanese air cover was destroyed in the 