Amidst the horrors of World War Three, the most precious resource was not land or oil or even men, but protein. It is for that reason that the fiercest fighting was over the breadbaskets of the world, as any livestock not used feeding the troops could be rendered down to create more.
In the darkest days, even the dead and dying were not wasted.
Biomass for the bioprinters. Meat for the meat-grinder.