Yeah, I was going to add the C-ration (and 5 in 1 ration) comment myself but forgot.

When I was in the Army (late 50's, early 60's) a lot of the C-rations had been in storage since the Korean conflict and had lost a lot of whatever flavor they might have had. The ones that I particularly did not like were the "Tuna, Noodles and Peas", the "Sausage Patties", and the "Hamburger Patties". The "patties" were about the consistency of a hockey puck and were cast into the can with congealed tallow. Eating this stuff cold was the pits. The only thing good about the C-ration was the whole pack of unfiltered, lung-buster, cigarettes (I smoked in those days) and the P-38 can opener. I used to have about 50 of the P-38's in a drawer; I have two of them left of about 1952 vintage; one goes on hikes with me when I have cans to open.