Prince Harry failed to make it to Sandhurst's top military alumni list in Vaughan Kent-Payne's new book "They Also Served."

Kent-Payne's publication featured the top 200 graduates from the military academy, including wartime Prime Minister Winston Churchill, Nigerian President Murtala Muhammed and Oscar-winning actor David Niven. Prince William also made it to the list and even penned the foreword. On the Prince of Wales' page, the author wrote that the future king "could not be deployed on military duty like his younger brother, Harry," Daily Mail reported.

The author's move was viewed as a snub by some. The new book came a year after Prince Harry released his memoir "Spare," where he talked about killing 25 Taliban fighters he described as "chess pieces," not "people."

Former British Army Colonel Richard Kemp reacted to the alleged snub and said he would personally include Prince Harry. However, he also understood why Meghan Markle's husband didn't make it to the list and wasn't even disappointed that he wasn't there.

"I probably would have included him, on balance, but it is not a disappointment to not see him in there," Kemp told The Sun.

"I don't think he did anything particularly notable during his service, but he was certainly a significant person to go to Sandhurst. I suspect the recent disharmony between him and the Royal Family has led them to decide against having him."

Kemp also clarified his stand about what Prince Harry mentioned in his book -- that they were taught to see their enemies as less than human.

"One thing he said in his book was the Army taught him to see the enemy as less than human -- which is not what we were taught," he said. "That has overshadowed a lot of the great things that he has done."

In Prince Harry's book, he mentioned killing 25 suspected Taliban insurgents during his two tours in Afghanistan. The leaked manuscript of this book revealed that he was neither "satisfied" nor "embarrassed" about the incident.

"In truth, you can't hurt people if you see them as people," Prince Harry wrote, per Time. "They were chess pieces taken off the board, bad guys eliminated before they kill good guys. They trained me to 'other' them, and they trained me well."

The author of the book, Kent-Payne, noted that "not everybody who trained [there] was a good egg" because there "is a smattering of traitors and cads" who reportedly trained at the prestigious base.

"They Also Served" is available for purchase at Sandhurst Trust's shop.

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Prince Harry, Prince William