The story
Coined by the United States War Department in or about 1942, from K + ration. The letter K is arbitrary, chosen to distinguish the name from earlier C ration and D ration.
Etymology from Wiktionary, CC BY-SA 4.0.
K-ration
Today it means: An individual daily combat food ration introduced by the United States Army during World War II and comprising three courses for breakfast, lunch and supper. Full definition →