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In modern times, the US military stockpiles “Meals Ready to Eat” (MREs), full meals that can be consumed with the convenience of just tearing open a bag, to sustain troops in the field.

To qualify as an MRE, the meal has to last three years when stored at 80 degrees or below. Most frozen pizzas will maintain best qualifty for about 18 months, though they usually remain safe to ...