Definitions for k ration
Random House Webster's College Dictionary
an emergency military field ration for use under combat conditions, consisting of three separate packaged meals.
Ref: Compare C ration.
Origin of K ration:
1940–45; K for Ancel Keys (born 1904), U.S. physiologist
a small package of emergency rations; issued to United States troops in World War II
An individual daily combat food ration introduced by the United States Army during World War II and comprising three courses for breakfast, dinner and supper.