The purpose of this report is to augment and supplement, but ot replace, current military policy. It is intended as a guide and reference for U. S. military small unit commanders and NCOs. Included are descriptions of all military rations, information on ration nutrient fortification, and ration composition. In addition, nutrition guidance is provided for military operations in temperate and extreme climates, and altitude. Answers are provided for frequently encountered ratio. questions. Appendices contain information on garrison dining and nutrition, the Military Recommended Dietary Allowances (MRDAs), foods providing certain nutrients, common nutrition-related medical complaints with suggestions for relief, and references for further reading. Heat, Cold, Environment, Altitude, Nutrition, Field feeding, Rations, Garrison dining, Temperate, Dehydration.