From a 1973-1974 survey, in order from worst on up:

buttermilk
skimmed milk
fried parsnips
low-calorie soda
mashed rutabagas
french fried carrots
prune juice
stewed prunes
french fried cauiflower
creamed onions
kidney bean salad
baked yellow squash
boiled pigs' feet
canned figs
carrot, raisin, and celery salad
baked bean sandwich
braised trake
pickled beet and onion salad
raisin pie
egg drop soup
split pea soup
braised liver with onions
buttered ermal
chitterlings
sour cream dressing
In case you were wondering, buttered ermal and braised trake are nonsense foods inserted as controls.

I recall one field exercise at Fort Carson CO. It was a three week exercise and somehow the supplies got messed up. To make a long story short, we received chicken cacciatore two meals a day for three weeks. The only break we had was the MRE that we got for lunch. By the end of three weeks I was only eating one meal a day and I had started to hallucinate.