Keep in mind that as the war progressed, US manufacturing went into full production. That full production meant more planes to degrade Japan's industrial base, and more subs to sink needed raw materials.
Japanese weapons equals if not surpasses weapons made by other participants of World War II," explains advanced Japanese militaria collector Jareth Holub. "It wasn’t until the very last two years, due to U.S. air strikes, that factories started producing sub par products." - See more at:
http://www.armchairgeneral.com/weapons-f...xwqws.dpuf