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The vegan/vegetarian diet problem is very real, and it is not just protein. You can very easily miss out pretty severely on a lot of things just by cutting meat out of your diet (iron, for example), and you do have to work hard to make sure you maintain a balanced diet. I don't see this as a problem for MREs, as composition has been pretty well solved, and I doubt it makes it any harder to solve the perishable proble…
Eating a balanced diet isn't hard as long as you don't eat the same thing basically every day (i.e. fast food). I think it's probably a non-issue, except for (say) naive teenage vegetarians - it's only a problem if you cut out meat but don't replace it with anything. I've done my research - if you have specific examples to the contrary, I'm all ears. I ate a vegetarian diet for seven or eight years, a vegan diet for…
This is, of course, because fish is just a specific kind of meat, so nutritionally it's not vegetarian in the slightest.
For years I was a vegetarian + fish guy. I hate pork, my family boycotts lamb, and I didn't have a taste for beef. Nowadays I eat the token hamburger every few weeks, because I've noticed I feel a lot better for it.