Prince William made a joke about his brother Prince Harry giving fellow soldiers "lip" in Afghanistan.

Prince William and Prince Harry

Prince William and Prince Harry

The 31-year-old royal served as a former attack pilot in two tours of Afghanistan, and at the unveiling of a new memorial to honour the fallen heroes of both the Afghanistan and Iraq wars, the 34-year-old royal made a quip to one of his sibling's former Gurkha colleagues.

Kaliash Gurung, 40, of the Royal Gurkha Regiment, met the flame-haired hunk in Afghanistan in 2007.

Speaking to him at the event in central London, William joked: "Well I hope he didn't give you any lip! Tell him where to go!"

Kaliash spoke of how he felt "sent back" to the mortalities he witnessed during his time at war in the country and it was a very "emotional" day for him.

According to the MailOnline, he said: "Some of my very close friends lost their lives, some of my very close friends have been injured for life. It's very emotional."

Before the shrine was unveiled there was a religious ceremony, where Harry paid tribute to his fallen friends by reading out a biblical passage.

He said: "There is a time for everything and a season for every activity under Heaven . . . A time to love and a time to hate, A time for war and a time for peace.

"From learning the hard way to stay onside with my Colour Sergeant at [military academy] Sandhurst, to the incredible people I served with during two tours in Afghanistan - the experiences I have had over the last 10 years will stay with me for the rest of my life. Inevitably most good things come to an end and I am at a crossroads in my military career."