Well, I don't know how much effect pitot heat would have during a preflight and takeoff in Guam. I know that people are suggesting it was just moisture built up but I don't know if it would be so little that it could just be burned off by pitot heat. I won't pretend to know anything about the B-2 systems but I know i have had totally unreliable AOA and told maintenance , they told me it was moisture and they would fix it. I watched them take off the probe cover and pour water out of the probe. Not the kind of moisture that the heat would burn off. Again I don't want to say this was the same type of situation but if turning the heat on was that important I think it would be mandatory not suggested. I'm also sure like faipsrule said the AF will take any opportunity to place the blame on the crew that they can.