The Mountain ration was produced from 1942 to 1943, and issued to soldiers of several elite U.S. and British Commonwealth forces then in training for alpine or winter combat, especially the 10th Mountain Division, and the First Special Service Force. As packaged, the Mountain ration was sized to serve four men for one day (three meals per man). It was normally prepared at the platoon or squad level, though 10th Division troopers were also taught to prepare it individually. The 1st Special Service Force first tried out the Mountain ration on November 28, 1942 during a training patrol to MacDonald Pass, Montana: