Don't know if you've read Gaunt's Ghosts, but they're worth a read, especially if you like the Imperial Guard.
Quote:
'We don't have time to debate this,' said the man with the slender face, 'but if we did, it would run like this. I would tell you that i was an officer of the Commissariat, and that I had the authority, on pain of death, to compel you to carry out my wishes. I would tell you that it was vital to Imperial security that this man remained alive, and would instruct you to carry out your function without further issue or demurral. I might even produce a weapon, just for show, to emphasise my seriousness.'
Doctor Kolding stared back at him.
'But I'm not going to do any of that,' said the man with the slender face, 'because we really don't have the time.'