They didn't use suicidal Technics, and used better tactics instead of waiting for the Americans to land on the Islands then kill as many as they could? I thought it was pretty foolish of them to lie and wait then just ambush the enemy. (Excluding Iwo Jima), the only offense they really used against the Americans were Banzai charges which 80% of the chance failed, and got more Japanese killed than U.S. Marines.