14/11/2017 2:21 AM AEDT | Updated 14/11/2017 4:01 AM AEDT

Prince Harry Criticized For Having A Beard At Remembrance Day

UK Press via Getty Images

Let's call this the one time (in recent memory) that everyone's favourite royal might have slipped up.

On Sunday, Prince Harry was criticized for breaking military rules by wearing a beard while on duty at a Remembrance Day parade.

Although the prince retired from active service two years ago, the 33-year-old still wore his British Army uniform as a senior Blues and Royals officer at the Cenotaph in London, reports the Mirror.

According to the news outlet, a serving member of the cavalry regiment said, "Prince Harry is letting us all down. There's no place for beards in the Queen's cavalry. He should have shaved it off for such an important day."

But because Harry isn't serving anymore, he can pretty much do what he wants.

"I can confirm that Prince Harry is no longer a serving officer and therefore does not have to comply with any of these regulations," a spokesperson for the Ministry of Defence told the Mail Online.

"He is, however, a member of the Royal Family and at times his duties require him to don the uniform of a tied or associated regiment and does so with a beard, as did his great-great-grandfather before him."

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Max Mumby/Indigo via Getty Images
Prince Andrew, Duke of York, Prince Harry and Prince William, Duke of Cambridge attend the annual Remembrance Sunday Service at The Cenotaph on Nov. 12, 2017 in London, England.

Those who serve in the British Army are forbidden to wear beards during parades except in rare circumstances, such as when a soldier is suffering from a skin ailment or their religion prevents them from shaving. Sikhs, for example, can't cut their hair and so are allowed to keep their beards while serving. Special Forces can also grow in their facial hair when they're behind enemy lines but they have to shave them off for parades.

However, according to the Forces Network, there is one position within the British Army that's allowed to have a beard when on parade: the Pioneer Sergeant. As per tradition, the Pioneer Sergeant would march in front of the regiment while wearing a "stout" apron that would protect his uniform while he was performing his duties. He would also carry an axe to clear the way for those following him.

In today's parades, the Pioneer Sergeant still wears a ceremonial apron and carries an axe, which takes the place of a bayonet.

Max Mumby/Indigo via Getty Images
A bearded Pioneer Sergeant (the only soldier in the British Army allowed to wear a beard) carries a Pioneer Axe (the symbol of the Pioneer Regiment) during the 23 Pioneer Regiment RLC Disbandment Parade at St David's Barracks on Sept. 26, 2014 in Bicester, England.

The Royal Navy traditionally allows beards, but officers could be told to shave them off if they're not full enough.

Interestingly, from 1860 to 1916, the British Army actually required soldiers to have a moustache.

Business Insider reports that Command No. 1,695 of the King's Regulations read: "The hair of the head will be kept short. The chin and the under lip will be shaved, but not the upper lip."

If a soldier went rogue and shaved his upper lip, he could face disciplinary action, which could include being sent to prison.

But don't worry, Prince Harry isn't likely to be sent to prison for proudly wearing his ginger scruff.

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