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Jack Lucas was indestructible. He joined the Marine Corps when he was just 14, after forging his mother's signature. Then he snuck onto a troop transport to Iwo Jima. When he arrived, his superiors allowed him to stay and fight instead of sending him back. In 1945, his unit came under heavy fire. Two grenades landed in their midst. Five days after turning 17, Lucas threw himself on top, pressing one into the sand while the other rolled away. Miraculously he survived but needed 21 surgeries to re