How does the quote “My squad is my family, my gun is my provider, and protector, and my rule is to kill or be killed” indicative of how Ishmael has changed from the beginning of the book? (chapter 13)

Ishmael has lost much of his care-free innocence that he once had. He used to have a rap dance routine with his friends: now he is a child soldier willing to kill or be killed in a bloody war. His loving family is replaced with guns and his fellow "soldiers".