In the book Vietnam book one the writer Chris lynch the theme of the book is perseverance because even after many fails he still step ups and drives the tank. We first see this in the story when Roman first sent to the army in basic training. Later in the story perseverance was shown when roman first starts driving the tank and fails many times but then starts getting the hang of things and does a good job. In the end when roman gets out of the army he goes to his girlfriend and he proposes to her and she said “yes”. In the end roman learned to never give up even though it get hard keep going.