If you don’t mind eating stuff that was dead before you were born.
Hey, it’s been sealed up in cans and stored at a constant temperature. I’d at least try it if I were starving.
Steve1989MREinfo has made a Youtube career out of consuming old c rations.
1951 Korea RCI C Ration B Unit Nightmare MRE Review Nasty Spoiled Old Food
1964 Vietnam MCI C Ration Ham & Lima Beans Vintage MRE Review
1969 Vietnam Meal Combat Individual C Ration Spaghetti Vintage MRE Review