Harry was said today to be "over the moon" that he will be going to Iraq with his regiment.
Sources at the Windsor-based Household Cavalry Regiment said he was a "very nice chap and a good officer".
"I would say he is over the moon as well," one said. "He has done all the courses to take his troop to war and it would have been sad if he was pulled out. He joined the regiment to do what the regiment does.
"He would see all his new friends disappearing off and he would be left behind with Chelsy."
He said the mood at the regiment was upbeat and busy, as vehicles were taken up to the ranges for firing practice.
"It’s a good day for us," he said. "It’s being portrayed as the HCR are going to war with Harry but really it should be the other way round. He’s coming with us because his commanding officer picked him."
He said Harry will not be stuck in an office for safety reasons but out on the front line, the troop leader of 11 soldiers.
"He is a very nice chap and a good officer," he said. "He’s approachable and talkative, not at all stuck up. He’s effectively the same as any other troop leader, no different apart from having protection officers in the same car as him."
It is still not confirmed what his squadron’s role will be in Iraq, he added.
"At the moment, all we know is that we’re going to Iraq," he said.
But he added that Harry’s involvement was never guaranteed even though he was always keen to participate fully.
"He is the third in line to the throne and you just don’t know what’s going to happen. Andrew went but he was much further removed from the throne. Harry’s a bit special, he’s Di’s boy."
There are concerns, he said, that Harry’s troop could be a target if too much is revealed about their whereabouts and roles, and urged the press to exercise restraint.
"It’s dangerous for him but it’s also dangerous for his troop as well," he said. "As soon as he is out there, that’s it. They will track him down, it’s not hard to find out where he will be going.
"If the press keep following him and reporting where he is, you’re effectively giving the map co-ordinates to the insurgents of where to find him.
"Iraq isn’t that big and what you don’t want is 1,000 insurgents turning up because there’s a price on his head. The press have got money to earn but we would like the minimum publicity."