OK I found it. It was on the site, here (lol)
This page
http://www.mreinfo.com/us/mre/us-govt.- ... tions.html says "One note:. according to this FAQ on the DSCP website:
http://www.dscp.dla.mil/subs/rations/FAQs.pdf "retired military can purchase MREs from their local commissary. If your local commissary does not sell MREs, you can ask them to do so, as they are eligible to purchase them from us."
But when I checked that link, I couldn't find that statement. What I did find was this, also on the Natick site:
"It is DSCP policy NOT to sell rations to individuals, whether members of the Armed Services or civilians. The Department of Defense regulations and DSCP policy permit the sale of rations to the following: U.S. military organizations, federal government-funded activities, activities empowered to perform a federal-government-legislated function, a DoD sponsored non-appropriated fund instrumentality, a State Department sponsored employee commissary located outside the U. S., a foreign government when an authorized contractual relationship has been established, a federal government contractor, when the contract specifically provides for the purchase of stock fund items by the contractor and other entities when authorized by duly appointed officials. In some instances sales are only permitted to these entities if other conditions are met."
So is a base commissary a "U.S. military organization" ?