It's a waste of time to heat MRE's. They're just as good cold.
Did you hear about the "First Strike" meals that the Army is buying? Supposedly they have all the food you need for a day in one package. Plus it weighs 2lbs less than 3 MREs would and has onle 500 calories less.
They took out all the fluff items, though. Like the little packet with Toilet Paper, Tobasco, matches.. And took away the heater. No candy, no deserts. But apparently they are healthier for troops on the go.
Btw, Ingredients: Imitation Boneless Pork Ribs (Pork, Water, Tomato Powder, Salt, Dextrose, Sugar, Sodium Tripolyphosphate, Worcestershire Sauce Powder (sugar, sodium diacetate, salt, dextrose, corn syrup solids, spice, citric acid, caramel color, dehydrated garlic and onion, cellulose gum, malic acid, natural flavor (OHMIGOD, say it ain't so!), onion powder, soybean oil, smoke flavor, grill flavor (malto-dextrin flavor (from partially hydrogenated cottonseed and soybean oil), modified corn starch, corn syrup solids), flavorings.
If my smoking bothers you, don't breathe.