After my short walk thru Panama, the medic that treated me said he was (expletive) shocked that my blood type was correct on my dog tags. Evidently there had been some he had seen that were way wrong. Having said that, I have a card and tag for each member of the family that is on their body at all times. Guess what, blood type is included.

For Gulf War 1 we wrote or blood type on our helmet bands.