When I first enlisted in 1972, C-Rations, or more properly the MCI--Meal, Combat, Individual--was breakfast, lunch and dinner in the field if there was no hot chow until I left the Army Reserves in 1984.
In 2007 when I re-enlisted MRE--Meal Ready to Eat--was the field food. MREs are delicious compared to MCIs. In fact, when I was in the field and the 20-year-olds complained about MREs, I would wish they could be given cold ham and eggs in an olive drab can until they were begging the First Sergeant to give their MREs back!
In 2010, after I returned from Iraq, I made a video comparing the two. This week it went over 100,000 views on YouTube when a soldier who went to Basic Training in 2007 commented on the video.