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When they were children, Marcel and Porco joined the Marley military to become Warriors. They were both excellent Warrior cadets and were chosen to become the next hosts of the great Titans. Marcel was a candidate for the Jaw Titan and eventually got it, while Porco was a candidate for the Armored Titan but Reiner Braun obtained it rather than him. This was due to Marcel's intercession, who managed to give his brother a bad reputation as he did not want him to become a Titan and have his lifespan reduced.