According to the decision to confront Japan, the United States has taken various measures and made necessary preparations militarily. 1On June 4th, 940, Roosevelt signed a bill to increase the number of naval vessels 1 1%. On June 30, the United States decided to own 6,543,800 pieces of army weapons and equipment, and reserve 2 million pieces of army equipment, with the ability to produce 4 million pieces of army weapons, and provide 6,543,800+08,000 planes for the army every year. 19 In July, Roosevelt signed the "Two Oceans Navy Act", which stipulated that during the period of 1940 ~ 1945, 4 billion US dollars would be allocated to build 257 additional ships of various types, with a total displacement of1325,000 tons, which enhanced the naval strength by 70%, including the construction of warfare. 16 In September, the United States promulgated a draft law, stipulating that all men aged 2 1 ~ 35 should register and prepare to join the army. At that time, the U.S. Army was relatively small, with only 270,000 army (including aviation), navy (including marine corps) 1940190,000, totaling less than 500,000, and the National Guard was 230,000.