I'm betting he'll be doing his hard partying behind closed doors so we don't get to see him at it. At least I hope so. Not holding my breath though.
I'm not sure that what he does is exactly "partying". We have no idea about how he feels at the moment. In his last interview it seemed his spirits were a bit on the low side.
IMHO he has just experienced what he had wished he could but hasn't found what he was looking for. He was still "Prince Harry" to some other soldiers. He's now back in Britain, more the prince than ever now he is "hardened" by war and gets older, he is to become an uncle, so probably even in his own perspective is moving up one generation.
And he killed and has yet to make his own inner peace with that - and for a son of Charles that may take a while, for I don't believe he is such a simpleton when it comes to morals and conscience. As it was said by this American colonel in the Mail: Harry was the gunner of the Apache helicopter. He fired the missiles and he saw how this action not only killed people, but has been "blasting them to smithereens."
Maybe it's because I was born in the early 60ties in Germany. I recall seeing a lot of invalids as a child. I saw my father and some of his friends suffer from the guilt they felt on having been soldiers in the war. My, I only learned after his death (as did his wife, my aunt) that one uncle had been an SS-officer who had done atrocious things. I never liked him but I know he felt regret. For what I cannot say, maybe even for having lost the war? but it was clear to me that he was a somehow broken man.
Harry, too, will find out he's changed. War does that to you. And he'll need time to adapt to that knowledge.
I'm not sure we have ever seen the "real" Harry. We don't know how much trauma his mother's death left in him. What it really was that made him decide on becoming a soldier. The wish for once to be "one of the boys" which is only to be had in the military? But - as he just found out, it's not to be had even there. Still some "gawked" at him, he said. Still some (and there will always be some there) saw him as "Prince Harry" and not "Captain Wales". And this at the most extreme place a man can go: a soldier actually serving in a war zone. Not a Royal visiting the troups, but one serving there like the others.
He gave the ultimative sacrifice to his country besides his life: he lost his innocense on killing. And he talked honestly about it and about his experiences.
The result: the media grilled him and made him a laughingstock for their readers who have no idea what Harry actually went through.
I believe Harry will do a lot of thinking now. He will grow up now and must try to come to terms with his being a prince. His brother was lucky: he found a princess to share his ivory tower with it and she brought a loving family along. He still lives in the Royal ivory tower but with enough people to feel comfortable.
Let's hope Harry will find his own solution to the questions of his life.