Why does Ishmael promise to fight hard and do anything for his squad after his foot is healed?

This is the first time Beah feels cared for in a very long time. He feels like he is a somebody and that he matters to something. Beah eventually opens up to Esther and recounts his experience being ambushed by rebels in the forest. In the bloody firefight Beah is shot three times in the foot; he awakens to find the sergeant doctor treating him and doing all in his power to make sure Beah survives the injuries. Beah states that this is the moment he realized his loyalty to the military would stay strong. Once the doctor is able to remove the bullet lodged in Beah’s foot, the boy begins recovering. Before he is fully mobile, he leaves his bed and asks for his weapon back.