It's not cut and dried that he has killed, only shot at. BBC:
On his role in Afghanistan, one journalist said: "You are the man with the trigger in your hand, and if called upon, you will fire, and presumably you have and you will kill the enemy?"
The prince responded: "Yeah, so lots of people have. The squadron's been out here. Everyone's fired a certain amount. Probably a little bit more than this time last year, to a certain extent, but that's just the way that its balanced out. Mainly due to weather, well whatever the reasons, I don't know.
"We fire when we have to, take a life to save a life, but essentially we're more of a deterrent than anything else."
He said missions to recover injured troops were a key role.
"Our job out here is to make sure the guys are safe on the ground.
"Now if that means shooting at someone who's shooting at them, then we'll do it."