These standardized field issue C-rations, or combat rations, were most likely produced between the years of 1941 and 1944 during World War II and intended for infrequent use when A or B rations were unavailable or impractical and K or D rations were insufficient.
Six rations were given to each soldier per day, which consisted of three "M-units" (meat rations) and three "B-units" (bread and dessert rations). Generally, these C-rations were not well-liked by soldiers because of the cans' bulky shape and weight, and because after a short period of time, they found the food to be monotonous and bland.