Prince Harry has broken 'at least four values of the military' in his memoir that included his claim he killed 25 people while serving as an Apache helicopter pilot in Afghanistan, Report informs via Yahoo News.
Former senior British military advisor Major General Chip Chapman joined several military figures in criticising Harry's claim in his memoir Spare, branding it "crassly and naively stupid" as well as "disloyal".
He also warned that Harry's book opens him up to "every jihadist and nutcase out there".
He said Harry's claims had broken the values of respect for others, integrity, loyalty, and selfless commitment.
In his autobiography, of which copies have been seen ahead of its official release on Tuesday, Harry reportedly writes about his two tours of Afghanistan, in 2007/8 and 2012/13.
His accounts include a series of bombshell claims, including the story of a physical fight between him and brother William over a conversation about Meghan.
His claim that he killed 25 people during his tours of Afghanistan, saying it was something he was neither proud nor ashamed of, has also attracted criticism from military figures.
Speaking to Times Radio, Maj Gen Chip Chapman, a platoon commander in the Falklands conflict, said: "We have a code of conduct. It's the values and standards of the military and he's broken at least four of those values that include respect for others, integrity, loyalty, and selfless commitment.
"You can't be any more disloyal, either both to the Crown and the Crown being a member of your family, so from both of those perspectives it's not really good."
He added: "It's crassly and naively stupid from Harry, his publishers and his ghost writer."
Maj Gen Chapman, former head of counter-terrorism at the Ministry of Defence, said while Harry is no longer a serving member of the military, books such as his often exclude sensitive details such as casualties in Iraq or Afghanistan but that the duke's places him and his family in greater danger.