Mountain ration
The Mountain Ration (or "M-Ration") was a United States military ration developed for use by U.S. troops operating in high-altitude or mountainous regions of the European theatre of World War II. == Origin, development, and use == The components of what would become the Mountain ration were developed in 1941–42 by U.S. Army officers in experimental mountain warfare companies, largely consisting of former ski instructors, forest rangers, and other experienced alpine travelers. Based on their recommendations, the Mountain ration was finalized and packaged for use by mountain and alpine troops by personnel at the Quartermaster Corps' Subsistence Research Laboratory in Chicago, Illinois.