What are the motifs in The Last Mission by Harry Mazer?

Family is a recurring idea in the story. Jack is the middle child of a family of five. Both Jack's parents still live as well as his older brother and younger sister. Jack is fiercely proud of his family and love his siblings. Jack also embraces his religion with a deep sense of pride. It is because of his love for his family and his religion that Jack knows he must go to war. Jack wants to be one of the soldiers who stops Hitler from executing Jews. Jack also believes that someone in his family should stand up for them against Hitler, so when his brother cannot go to war, he volunteers despite his young age.