Don't know it, I think I'm A+ but I'd have to have a test to confirm ...
As our ACU trainer said - "I wouldn't recommend guessing it."
blood group is not really an issue, if you are chucking blood out by the bucket load they will just pump the most common into you and that will do the job. they will give you a test in situ to determine your exact match anyway. you may be a certain group but there are still varying degrees of match within it.
I asked my doctor for my blood group and he said they will not pump blood into you without a test it is too dangerous!! plasma is what they would put into you if needed whilst a type test was carried out and he pointed out that no circuit ambulance would keep anything other than plasma.