From the first Majuro plan to Tan No. 1

The earlier Majuro plan called for nine aircraft carriers, four escort carriers, 530 carrier aircraft, and another 300 aircraft from island bases. Five submarines were also to carry ten amphibious light tanks armed with aerial torpedoes, which would cross the coral reef and attack carriers in the anchorage during the air strike. The air component resembled the Philippine Sea battle plan, although this was a separate operation. Mitsuo Fuchida's later Tan No. 1 proposal reduced the attacking force to 27 torpedo bombers and 27 dive bombers, after reconnaissance from Truk. It still aimed at a heavily defended anchorage expected to hold roughly twenty American carriers. A second Pearl Harbor remained the ambition despite the reduction from 830 aircraft to 54.