The Imperial Guard is a tough place for anyone... woe betide you if you fall foul of the rules and regulations.
Those who commit a crime that does not warrant immediate execution or petty punishment may find themselves assigned to a Penal sS
You will be given the most basic of weapons and equipment and be expected to lead the assault from the front. If by some miracle you survive a mission (or ten) then you may have the opportunity for some redemption.
More likely you will be just softening up the enemy and absorbing some of their ammunition.