C1 Protractor - not only did I get my hands on one of those bad boys, but I know how to use one too! (or at least I hope I can remember how to use one, it's been a couple years). Sure, I was only a cadet but still... I cherished those things.
The waffle-knit field scarf, what a wonderful thing. Not only did it keep you toasty warm when it's kilometres of fabric were wrapped around you, but it could quickly be deployed into a field pillow and etc.
Bivy bag is awesome, I've used it more times at home than I ever did in the field thanks to superior built te.... Actually, our tents sucked and I refused to sleep under anything that wasn't a hoochie tarp or in my bivy bag (the only thing's you could truly rely on to keep you dry and some what warm and sheltered).
cup, canteen handed down to me from my father was a life saver on many a frigid exercise up at Camp Howard, sipping on IMP coffee (not the best but it did the trick) or minestrone soup.
Coleman two burner stoves were great, but if I could marry an inanimate object it would be the collapsable single burner stove that fit neatly into a "C9" pouch (oh no! a cadet with a C9 pouch!

). I would sit down and cook some Campbells soup or beef ravioli... mmm... yummy.