I go by what the Army says. ;) I see what you are talking about, The box said Meal, Combat' Individual with a
C below it and we called them C-rats. There wouldn't have been much chance for leftovers when you were in because like you said, they modified the original WW2 rations 3 different times between '48 and '58 and had another ration that they called E rations briefly before they went over to the MCI's. The can sizes were not the same in the old C's, be they 1, 2, 3 or 4 as what we would have had post 1958.My dad said that the K's were the ones that had leftover ib 1960 because they were freeze dried and they weren't using them much. They were using the canned rations at a pretty good clip. Did you ever actually see any OLD boxes of rations? I saw a 1963 box on E-bay and I know if was from 1963, well, because it had a manufacturing date stamped in large letters on the end of the case. But, for all of the joking, the oldest C-rations that I recall seeing even in reserve units were maybe a year or so old. We didn't really keep any rations "in stock" at the reserve center even after the switch to MRE's. As for the cigarettes, a website i found said that the DOD eliminated them in 1975. Also, the Lucky's were not the only smokes available. They also had Pall Malls' LOL. But seriously, during the Vietnam era, there were apparently 11 different brands of cigarettes from all of the major manufacturers included in the rations. From what I can find and was told, by the time they eliminated them in 1975, Marlboro may have been the only brand they were buying.