The grizzled war vet can be of any class. Some classes may required more inspiration to write the story. Class can help build an identity, but it’s not mandatory.Another thread got me thinking about this, but its something that has bothered me about the majority of RPGs I've played since the 80s.
When you introduce your character how do you describe them? Is it "human fighter" or "grizzled war vet?" Does that "grizzled war vet" need to be a fighter? Couldn't you also build them as a ranger, paladin, rogue, or even a cleric or wizard? Would you still describe them the same way? At what point does your background or character concept supersede your class identity? Should classes even have an identity?