First take a look down into the food forum. Tons of info posted there about food. Here is one example of pdf's placed, but they are all in the food forum. Their is a major blend of operational rations (SoPak and Ameriqual (also goes under the name APak), MRE Star (which I bought about 70 cases, they offer free shipping based on the number of cases you buy), commercial rations (Mountain House, Augason Farms, Emergency Essentials, Legacy, etc are mainstays for my preparedness and these are a blend of number 10 cans, bulk and also when it comes to the buckets/individual pouches are used in our INCH gear). Like above, I would start simple and slow, as everyone else stated as above. Also like most of the folks in here, big advocate of buying what you would eat out of your pantry. So sugar, salt, flour, etc...that is all bulked, is rotated in/out and used during normal cooking to replaced with a run to the SAMs, Walmart or when on sale. Example, salt...I have them stored in 5 gallon BPA free canisters, with about 20 containers that is a bunch of salt, but a necessity. I don't buy too much enriched flour or wheat that is already grounded, most of them are in number 10 cans, dated with purchased date, but the bulk wheat can be grounded with a mill.
http://www.doomsdayprepperforums.co...u-and-other-mil-ration-facts.4794/#post-55609
As for LRPS, they were pretty much rotated out during the early 80's, MRE's were their replacement and during the Iraq/Stan operations, Natick and Defense Supply authorized the implementation of a new LRP, but they do not resemble the old ones used in Vietnam. The news one are simply freeze dried MRE' lines made by Mountain House. I know of only a few distributors who have them and because of rotations made by Defense Supply, stocks are somewhat limited to the last 2015 run. I think Epicenter sells some, attached is the link. Personally, I'd just go buy a bunch of freeze dried packets as mentioned above, the cost for LRPS and the fact that their shelf life would be suspect, would be the two things I'd be concerned about.
http://theepicenter.com/lrp-long-range-patrol-rations-mountain-house.html
Lastly, I have stored the better part of all my operational rations and MRE's in a humidity and temperature controlled storage unit, the setting on it is about 50 degrees for a reason, to extend the rations shelf life after purchasing them. Most people who buy operational rations or emergency rations don't think of where to store them. All told, I have about 20 MREs, 20 buckets of commercial, bulk and 10 cans in my home. This is a real pain in the butt, when your trying to find a nook to place them in closets. If you store them in a shed or garage..just take a look at the temperature of said material during the summer, your shelf life will be cut very quickly. My thoughts, but then I spent 20 plus years eating them and also testing them for wholesomeness/operational use. Don't believe me, well here is a good test to see if the MRE's are heat stressed, open your accessory packet, find the hot sauce, if it is dark red, not the red orange color of normal hot sauce, you know that the rations have been stressed. In this case, ration items like noodle {Tuna Tetrazzini), will be suspect for heat stress.
Also one last thought, never buy off Ebay...sure you might be getting a deal, but you never know what the shelf life is and going by pack date, they wouldn't be unloaded on EBay if they were ration ready.