MREs produced by/for the US government are NOT GLUTEN FREE, it says so here on page 63;
However there are many comparable instant type GLUTEN FREE meals. I found some at these places:
Note since I am from the US most of these places are as well
My Own Foods has entres sold here.
Alpine Air has boil a bag and foil bag food intended for camping I believe, here.
Trail Food Express sells backpacking foods here.
Wilderness Dining has more backpacking foods here. (Thanks Frank Lazaro)
Tasty Bite has near instant food, here.
Tasty Bite also has a giant gluten free combo kit called Gluten Free Greatness
The closest thing to an MRE is an actual MRE made by the Finnish the website is not in english but here is where i found it with an English translation:
and the actual item is here(click police/military and go to the bottom or just go here)
I found a few other things came but I am unable to find them for sale anywhere other than Ebay.com for example
Best Choice
Toasterz makes Eaterz and Heaterz which I have seen on ebay.com as described as gluten free but seems to be only sold in Canada and not by anyone who deals online.
It would seem that Eaterz are placed in Heaterz, cooking them. This makes them the best choice for me as the times when I would eat an MRE type option I would like not to heat some water or need a microwave. Also they reuse part of there packaging and refund 10 cents each for them. I'm not sure how that works but it sounds great.
I am not responsible for the actual gluten free -ness of anything.
This came up because my room-mate is in ROTC and I am sick of apples for now. I actually thought an MRE would have been nice.
