Two notes:
In 1960 at Quantico, VA, I had my first exposure to C rats. They came in a "shoebox" w/ three meals for the day.
Included was a full pack of cigarettes, in my case a pack of Luckies in a green and red packet.
This green and red pack was discontinued in 1942 and changed to the familiar red/white bullseye pack w/the slogan "Luckies go to War"
The hamburger was lovingly referred to as "ground mouse"
During 1967-68 in 1st Amtrac Battalion at Cua Viet, RVN it was widely known that to eat the apricots that came in some C-rats was a guarentee of incoming artillery.
The place is probably still littered with unopened apricots.

Semper Fi