Blame the treasonous media, for reporting details on his deployment — just as he did, when he served on land. He was ready, willing, and able to serve as a combat helicopter pilot, with all the risks that entails. At least, he was before he was outed.
Now, that the Taliban have targeted him, it's only sensible to take some precautions. However, sending him back home (with his tail between his legs) would be a victory for the Taliban. They should not be allowed to succeed at this.
Since Prince Harry is the Royal Bait, hopefully now it’ll be real easy to get the Taliban out from where they are hiding and Prince Harry’s Apache Gunship will smoke ‘em all out.