As a submariner, the only time I ever ate, let alone saw, an MRE, was when I was on the tender in Guam and Typhoon Omar blew half the island off the map.
We ate them when we went out for cleanup, and even then, half the time, the locals were doing BBQ for us as we helped out, and partly to get all the refrigerated and frozen stuff eaten before it went bad.
Then again, I've got two cases of MRE's in the basement as emergency food. I'm still looking for an expiration date on them. Seems there isn't one--just a pack date. Go figure.