Wiktionary
k ration
n. An individual daily combat food ration introduced by the http://en.wikipedia.org/wiki/United%20States%20Army during World War II and comprising three courses for breakfast, dinner and supper.
Usage examples of "k ration".
After a bit, though, he gave it up and went down to the shore, where he ate a K ration, topped off his canteen, then removed his jumpsuit and used moss and icy lake water to scrub off the cow manure.