Bloodstripes are the red stripe down the trouser leg on Marine NCO and Officers dress blue uniform trousers. Legend has it that this stripe stands for the blood shed by Marine NCO's and Officers in combat.
Getting your bloodstripes is not something most Marines take lightly. It means something, it is important. They mean that you have become a leader of Marines.
They are not the only bloodstripes that are important. Who his own self bare our sins in his own body on the tree, that we, being dead to sins, should live unto righteousness: by whose stripes ye were healed. (1 Peter 2:24) See Christ took our punishment and shed His blood for us. He is our leader too.