I ate some Cs that were older than I was.
Amazed all around in USAF boot camp ( 1979 ) by making “sandwiches” out of the meat disks and crackers. I had C-rats years before. Thought people there would figure it out themselves but none did till they saw me doing it. In all cases the C-rats were pre Vietnam war.
Spent my 1st military birdgiving at Lowry AFB, Colorado in aircraft weapons tech school. Was home for Christmas.