The shelf life of LRRPs is about 150 years or so. The government makes sure that when they need something it would be ready and waiting for them. I remember in basic we were eating C-Rations from WW II. You could get at least one puff off the cigarette before it burnt your lip.

I have seen them in some outdoor magazines but not to many other places. You could always load up a few cans of spam and a box of cracker and some peanut butter. Maybe that's what I should do is in invent the "Nam Diet". When I returned home I only weighed 120lbs. Long time since I saw that on the scale. That's another thing they don't tell is when you get old you can't loss weight anymore.