Question

Why did the Allies capture so few Japanese soldiers when they attacked Iwo Jima?

Answer 1

As is known by history buffs and most people, the Japanese were a very honorable civilization. They worked hard to win, and when all else failed, they committed suicide. Not the type of suicide you think, no, they would "Kamikaze." This meant that all else had failed. It included the individual taking his/her life to try one last time to kill the enemy. 

I have a well-known example for you. During some major ocean operations, the Japanese would fill their planes with bombs and then dive into the ships. This was a trend with the Japanese, and the soldiers would do almost the same. 

Hope this Helps! :)