DFFDLOsmall amounts of high-energy food, carried by soldiers, mountain climbers etc 〔士兵、登山者等随身携带的〕应急口粮〔量小但热量高的食品〕
Examples from the Corpus
iron rations• These would be my iron rations for a hard day's cruising the streets in Armstrong.• For Jaq by no means equated iron duty with iron rations.