Lightbringer said:
Here's another option if you don't like the cannibalism concept:-
"For centuries, the Adeptus Munitorum has issued Imperial Guardsmen across the Galaxy with emergency supply rations. These high energy, protein-based provisions come in a variety of forms, from tinned meat of a sickly grey pallor, through chemically self-heating soup canteens to foil-wrapped chewy brown bars that leave an unmentionable coating of fat across the roof of the mouth. The common denominators linking these products are the utterly appalling taste, and the "CS" stamp emblazoned on the crates that contain them.
Over the years, many grim jokes have sprung up around the origin of the meat contained within these rations. While dull and worthy Munitorum clerks will insist that "CS" is simply an alphanumaric code for "Combat Sustenance," the gallows humour of the average guardsman demands an acronym more suited to the ration's taste. As a result, a variety of alternatives have been suggested, including "Cat Sh*t," "Crap Sandwich," "Crippling Scurvy" and "Consumption=Suicide."
In the Calixis Sector, the acronym "Corpse Starch" has gained particular popularity. So widespread is this grim moniker that it has found its way onto official documentation, and indeed it has become ingrained within the mindset of many inhabitants of the Sector. Some guardsmen joke that given the way the taste of CS rations is, if anything, actually getting worse, suppliers must have taken the name to heart, and are sourcing meat from the local morgues..."
Hah, you know that's a rather clever background. Kudos!