Captain Kurtiz:
You didn't forget what you have to do, right? Well, I can tell you again.
You have to participate in a siege or a dimensional siege. When you reach the Flag of Protection inside, you'll be able to obtain a Mark of Valor. Your mission is to obtain 10 of these.
You'll be able to get more marks when you participate in a dimensional siege or in the Aden or Rune Castle Sieges.