Ok, most obvious one would be "Last Stand"
The Imperial Guard automatically pass all morale (Note: Morale, not leadership, so no free commands) tests as they know there is no way out, and they will either kill everything, or die.
Also as this is a last stand, all vehicles have been disabled or withdrawn in the evacuation that took all logs and things from the camp. Guard are deemed expendable and thus would have taken up too much room on the dropships, left behind to fend for themselves with only a few support weapons. As such, the guard may have no vehicles, instead they may place D3 "Support Guns" (Effectively free weapon teams)