The MRE reference article from the English Wikipedia on 24-Apr-2004
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MRE

Meal, Ready-to-Eat (MRE) is a self-contained meal in lightweight packaging produced by the United States of America for its soldiers in the field where organized food facilities are not available. They replaced C-rations in the early 1980s.

Each meal provides approximately 1200 kcal (1200 "Calories"). Contents include: an entree or starch, crackers, a cheese, peanut butter or jelly spread, a dessert or snack, beverages, an accessory packet, a plastic spoon and a flameless ration heater (FRH).

Packaging requirements are strict. MREs must be capable of withstanding parachute drops from 380 m (1250 feet), and non-parachute drops of 30 m (100 feet). The packaging is required to maintain a minimum shelf life of three years at 80°F(27°C) or six months at 100°F(38°C); additionally, short-term temperature extremes of -60°F(-51°C) to 120°F(49°C) must be sustainable.