The Duke of Edinburgh is to celebrate his 99th birthday quietly at Windsor Castle, as the coronavirus pandemic and nationwide lockdown measures continue.
A photo of Prince Philip with the Queen has been released to coincide with the occasion, and features the Duke wearing a Household Division tie.
The restrictions mean that, unlike Prince Philip's previous birthdays, there will be no official military gun salute to mark the occasion on Wednesday.
A spokesman for the Ministry of Defence said: "We can confirm that, following consultation with key stakeholders, ceremonial gunfire from all saluting stations continues to be temporarily suspended due to national COVID-19 restrictions.
"Future such events will continue to be regularly reviewed in conjunction with current Government COVID-related guidance."
Earlier in the year, before the Queen turned 94, traditional gun salutes were halted as they were not deemed to be "appropriate" while the country dealt with the virus outbreak.
Prince Philip has been married to the Queen for more than seven decades, making him the longest-serving consort in British history.
He carried out his last-ever solo royal engagement in 2017, the Captain General's Parade at Buckingham Palace.
The event marked the end of the 1664 Global Challenge, a series of exploits that have pushed marines from the Corps to their physical limits in aid of the Royal Marines Charity.
Prince Philip's military appointments
The Duke of Edinburgh served in the Royal Navy until July 1951, but he remains very close to the Armed Forces.
He was appointed Admiral of the Sea Cadet Corps, Colonel-in-Chief of the Army Cadet Force and Air Commodore-in-Chief of the Air Training Corps in 1952.
The following year, Prince Philip was promoted to Admiral of the Fleet and appointed Field Marshal and Marshal of the Royal Air Force.
On his 90th birthday in 2011, he was appointed Lord High Admiral by the Queen.
In 2017, he was succeeded as Captain General Royal Marines, a position he had held since 1953, by his grandson, Prince Harry.
The Duke has also been Colonel-in-Chief, or Colonel, of a number of British and overseas regiments.
Cover image: Prince Philip with the Queen earlier this month (Picture: PA).