i love spam too. i mix up yellow mustard and brown sugar and put it on while frying. messy cleanup but good with eggs or on sandwiches, cooked or cold after being cooked. probably ok cold. i suspect the ham slices meal in C-rations was round spam.
I think not. Comparing Spam and ham slices is really no choice. The ham slices were mostly gristle, sinew, veins, fat, and bone.