What is the theme in Child of Hitler: Germany in the Days When God Wore a Swastika by Alfons Heck?

Alfons Heck's story primarily concerns his life between ages ten and seventeen, while he was a member of the Hitler Youth. The Hitler Youth was a paramilitary organization of young people, boys and girls, that was a wing of the Nazi Party. It was created in 1922 and lasted until 1945. Initially it was simply a branch of the Nazi Party, before the Nazis came to power, but once Hitler became chancellor the Hitler Youth was made a national organization. As time progressed, membership in the Hitler Youth became compulsory.