It seems to me that the insurgents are already going all out for our people in Iraq, so there probably isn't much 'extra' risk for the troops that Harry commands.
He is a commissioned officer, he is trained & ready, & should go - to not do so would be to imply that his life is worth more than any other & therefore too valuable to risk out there. Yes, it would be a coup for the insurgents if he was killed, wounded or taken hostage, but it's probably no more likely to happen to him than any other serviceman out there. The Royal Family have always served in the military, as they should do, & they should not be above being put in harm's way for their country.
It would be good to see some of the politicians' kids in uniform!