Question

Why did the Allies capture so few Japanese soldiers when they attacked Iwo Jima?
The Japanese had successfully fortified the island.
The Japanese had planned for no surviving prisoners.
The Japanese inflicted terrible casualties on the Allies.
The Japanese hid among the civilian population.

Answer 1

"The Japanese had planned for no surviving prisoners."

Explanation: Japanese defenders on Iwo Jima were ordered and prepared to fight to the death. They built deep bunkers and cave systems to prolong resistance, were indoctrinated against surrender, and often killed wounded or themselves rather than be taken. That doctrine — not hiding among civilians (most civilians had been evacuated) or simply the island's fortifications or Allied casualties — is the primary reason so few Japanese were captured.