Originally Posted by Grog
<with my geek hat on>
Your point is valid (and it sounds like you've eaten your share of them).
C-rats, as we affectionately called them, were still going strong into the 1980's. IIRC, it wasn't until about 1983 that MREs replaced them...so...c-rations fit in line with cassette tapes and even CDs (which went mainstream ~1980). A mere 25 years ago.

CD's went mainstream around 1980?

I must have been way behind, but I don't remember CDs taking off until closer to 1990 than 1980.