OOC
The Guard is a great shared background because no matter what we are from scum to psyker, adept to actual guardsman the Administratum can fuck up properly reassign you to the Guard. We few would be lucky ones, depending on your point of view, that we didn’t die in the notoriously deadly Guard but got plucked into service with the Inquisition. Though we could still be operating alongside the Guard but no longer part of it depending on the needs of the story the ST wants to tell.