看一下美国兵的C作战口粮吃点啥：

On 1 November, 1939, the Adjutant General announced the adoption of field ration C. It consisted of 3 cans containing a meat and vegetable component, and 3 cans, containing crackers, sugar, and soluble coffee; it furnished 2974 calories, 114 grams of protein, and an adequate supply of vitamins and minerals.