It depends....for best flavor and nutritional value, about 2 years max from date canned (assuming commercial packing).
The USDA has some good info on this.
MRE's depend a LOT on how they're stored, cool is better. If stored at 50F or less and not allowed to freeze, they're good for 10 years. If the temp goes up to 120F, about four months.
Emergency Medicine - saving the world from themselves, one at a time. "Thou shalt not be a victim, thou shalt not be a perpetrator, but, above all, thou shalt not be a bystander." I make the ADL soil themselves. And that makes me very happy 
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