There are many reasons why he wrote the book. It is a book of his life and he used it to get over the thought of war he had when he came home. It was created for a college essay and they he was told to get it published. When he was 19 he joined the army and went to boot. His motivation was 9/11 to join. He tells how combat has changed his life when he was deployed. This book is how his life went and changed after the war.