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Such packets are included in MREs (Meals, Ready-to-Eat) and are referred to as "flameless ration heaters". The packets contain finely powdered magnesium metal, alloyed with a small amount of iron,...
Answer
Such packets are included in MREs (Meals, Ready-to-Eat) and are referred to as "flameless ration heaters". The packets contain finely powdered magnesium metal, alloyed with a small amount of iron,...