Prince Harry will represent Queen Elizabeth at the Sovereign's Parade next Friday (15.12.17).
The 33-year-old royal will act as the Reviewing Officer at the event, which formally marks the passing out of Officer Cadets who have completed the Commissioning Course at the Royal Military Academy Sandhurst in Camberley, Surrey, south east England.
A tweet on the Kensington Palace Twitter account read: "Prince Harry will represent Her Majesty The Queen as the Reviewing Officer at the Sovereign's Parade on Friday 15th December."
Harry's fiancee Meghan Markle is not expected to be in attendance alongside him.
British Prime Minister Theresa May represented the queen at the Sovereign's Parade back in April, and told the troops the world faces "more complex" threats than ever before.
She said: "The world into which you all now enter is also very different from that which confronted many of your predecessors.
"The threats we face today are more complex than ever before. And the missions that you will be asked to undertake will be similarly complex."
As well as Harry, Duchess Catherine will also be in royal action next week as she heads to the Rugby Portobello Trust's community centre.
A Kensington Palace tweet read: "The Duchess of Cambridge will join children and families to celebrate the work of the Rugby Portobello Trust at its community centre in North Kensington on December 12."
The Rugby Portobello Trust helps youngsters to build their community by providing facilities, skills, activities and guidance.
Catherine is currently pregnant with her and husband Prince William's third child, a brother or sister for their son Prince George, four, and two-year-old daughter Princess Charlotte.