With all the other stories out there here is a nice one:
Vietnam Veteran Keeps Vow, Eats 40-Year-Old Cake
http://www.foxnews.com/story/0,2933,534776,00.html
"Moak got the drab olive can as a Marine helicopter pilot off the Vietnamese coast in 1973. He vowed to hang on to it until the day he retired, storing it in a box with other mementos."
A grunt would have kept a can of peaches to go with it.