The big risk I see is that if the meal itself freezes, I'm not sure the heater module is hot enough to thaw it. I know that an MRE heater won't defrost a hard frozen MRE; can't imagine these guys are any better off.
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-IronRaven

When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.