This song is a war song. It inspires people to fight and to keep fighitng. Showing your scars is a way of scaring your enemy, showing them your history and experience in this field through your extensive scars. The more scars you have the more experience you have and the harder you die. Therefore giving it your hardest s*t everyday is the best way to ensure you have the most experience possible for when you come to the next fight, as long as you stay alive, so fight to the final breath otherwise it's jsut going to be a wasted breath.