Prince Harry will sacrifice his military titles and appointments once he and Meghan Markle officially step down as royals.
As part of the new arrangement, Buckingham Palace said Harry will give up being Honorary Air Commandant Royal Air Force Honington and Commodore-in-Chief of Small Ships and Divings.
He will also lose the title Captain General of the Royal Marines, a role he was given by Queen Elizabeth in 2017, succeeding Prince Philip.
Although Harry is a retired Armed Service personnel member, the new deal also prevents him from wearing his military uniform at public events, including Trooping the Colour and Remembrance Sunday at the cenotaph, a former head of the Navy told the Telegraph.
"The next time he is at a military event he should be in civilian clothes because he is no longer involved with any military units," Lord West of Spithead told the Telegraph.
"It is very unfortunate. It is very sad to be losing him from the military."
During his military career, Harry spent 10 years in the army where he undertook two operational tours of Afghanistan and qualified as an Apache helicopter commander. His career came to an end in June 2015.
While working as a royal, Harry founded the Invictus Games, a competition for injured, sick and wounded Armed Forces personnel and veterans.
From spring 2020 in the United Kingdom - autumn in New Zealand - Harry and Meghan will no longer be working members of the royal family, meaning they won't represent Queen Elizabeth or use their His/Her Royal Highness status.
As part of the deal to step back from royal work, the pair will also no longer receive money for public duties and they must pay back the Sovereign Grant funds used for the refurbishments of their home Frogmore Cottage.
Harry and Meghan will keep their private patronages and associations, and have sworn that "everything they do will continue to uphold the values of Her Majesty".
