Spare: UK military veterans criticise Prince Harry after he reveals killing 25 people in combat in leaked memoir

Prince Harry has been slammed by military veterans after he revealed in his memoir 'Spare' he killed 25 people while fighting in Afghanistan as an Apache helicopter pilot.

In the Duke of Sussex's memoir "Spare," in which a Spanish-language version was released on Thursday local time, Harry revealed he didn't think of those he killed as people but instead "chess pieces," he had taken off the board, Daily Mail UK reported.

According to the Daily Mail Harry killed 25 people during his second tour in Afghanistan and said it was: "not a fact that filled me with satisfaction but I was not ashamed either."

Former Royal Marine Veteran Ben McBean criticised the prince on Twitter after the revelation. 

"Love you #PrinceHarry but you need to shut up! Makes you wonder the people he's hanging around with. If it was good people somebody by now would have told him to stop," McBean tweeted.

Colonel Bob Stewart who is an MP for Beckenham, UK told the Daily Mail: "I wonder why he is doing such things. Real soldiers tend to shy away. People I know don't boast about such things. They rather regret that they have had to do it."

Colonel Stewart who was awarded the Distinguished Service Order after seven tours of Northern Ireland and leading UN forces in Bosnia, also said he felt like Harry was destroying everything he had been given and had taken his privilege for granted.

"I just think it is so sad because so many people have not had Prince Harry's chances in life, and the whole thing seems to be a bit tragic," Colonel Stewart told the Daily Mail.

The "Spare," memoir which was supposed to be released on January 10, is the first time Harry has talked about the number of people he had killed while he was stationed in Afghanistan in 2007-2008 and 2012.

Prince Harry wrote he was able to see how many people he killed in combat because they were "in the era of Apaches and laptops," and therefore able to know the exact number of fatalities.