iron rations

Their leather pouches which held enough iron rations to keep them going were always at hand.

A mouthful of iron rations, a drop of tepid water from my flask, which water has a pronounced taste of tin.

The food (iron rations), corned beef and biscuits and tea, and sometimes a little jam, is not conducive to mirth-producing.

In some of them you pack iron rations, food for a day or so.

He was dirty and unshaven inside the unit, sick of iron rations pushed through the airlock, stiff and sore with exertion.