The CFD has said MREs aren't loaded with preservatives or chemicals and their shelf life comes from the processing and packaging. Longevity was only one consideration, according to Whitsitt.

In addition to this, the MRE has been designed to fulfil all operational requirements. This means that they remain shelf stable for a minimum of three years, or nine months in warmer climates.

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In the US, MREs have to fulfill a number of requirements. They need to have a minimum shelf life of 3.5 years at a mild temperature, or nine months in a hot climate. They also need to be able to ...