The event marked 80 years since the Allied landings in Normandy that shifted the course of World War II.

Speaking in Ver-sur-Mer, Charles honored fallen Allied soldiers, French civilians who sacrificed their lives, and the bravery of the French resistance.

“It is with the most profound sense of gratitude that we remember them. And all those who served at that critical time,” he said.

The King highlighted the importance of learning from veterans’ stories and emphasized the enduring obligation to remember their contributions and achievements.

Harry had the prestigious title removed by the Queen in 2020 after he and Meghan announced they would step down as working royals and move to California.

There had been speculation about which member of the Royal Family would be given the role, with Princess Anne tipped for the position.

The Duke of Sussex was appointed Captain General by the Queen in December 2017, succeeding Prince Philip.

Today’s announcement comes just a day after Harry unveiled his ‘provocative’ new memoir Spare,  a ‘loaded’ reference to his position as the younger brother of the heir to the throne.

In a personal message to the Royal Marines as they mark their 358th birthday today, the King said: ‘It is the greatest possible pleasure to assume the role of your Captain General. I am exceptionally proud to follow in the footsteps of so many members of my family over the last three-and-a-half centuries, all of whom held the role with a deep sense of admiration.

The Royal Marines have a distinguished and unparalleled history, both on land and at sea. I draw immense inspiration from your courage, determination, self-discipline and a remarkable capacity to endure in the most extreme environments.

‘I feel greatly honoured to become part of the Corps Family and very much look forward to meeting many of you in the near future. In the meantime, this comes with my heartfelt and special wishes for a very happy 358th birthday. Per Mare, Per Terram.’

In 2017, Harry had succeeded the Duke of Edinburgh, who had held the post for 64 years before standing down following his retirement from public duties.