Prince Philip is said to have requested a 'rallying cry' at his funeral to remind his family to support the Queen and the institution.
The 99-year-old also wanted a low-key 'no fuss' funeral and his wishes will be granted when he is laid to rest.
The Duke of Edinburgh died last Friday - just two months before his 100th birthday - and his funeral will take place in St George’s Chapel in Windsor Castle on Saturday.
Despite long-established plans being redrawn due to the pandemic, it is said that the funeral is still taking place in line with the duke's wishes.
This includes the The Last Post being sounded by Buglers of the Royal Marines from the west end of the Nave.
The symbolism of the final call is "a deeply stirring sound" which is expected to resonate with his loved ones.
A senior palace official said: "The Last Post which will be sounded by Buglers of the Royal Marines is usually a bugle call signifying the end of the day's activities. But on this occasion it will signify a soldier has gone to his final rest.
"The Duke also chose to request the buglers of the Royal Marines to sound Action Stations.
"It is a deeply stirring sound and typically an announcement on a naval warship that all hands must go to battle stations.
"The symbolism of his final call will not be lost on the family. That even in the Duke's final moments before he is laid to rest he was calling on his troops, his family, to man their posts.
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"The Duke often spoke to his family about the need to support the Queen and the institution and perhaps there is no more prominent time than this given the recent history and controversies raging within the family.
"It is very much hoped by all that they use this as a rallying cry to come together."
Due to coronavirus rules just 30 guests will be allowed at the televised funeral which starts at 3pm when Philip's coffin arrives on a specially modified Land Rover he helped to design.
All mourners will be required to wear face masks and must stay at least two metres apart from anyone not in the same household.
Among senior royals who will attend include three of Prince Philip's relatives from Germany.
Bernhard, Hereditary Prince of Baden and Prince Donatus, Landgrave of Hesse are the Duke's great-nephews and a cousin Prince Philipp of Hohenlohe-Langenburg and are currently isolating in the UK in time for the funeral.
The duke’s coffin will remain at rest in the private chapel of Windsor Castle until Saturday when it will be covered with his personal standard and decorated with a wreath of flowers and his Naval cap and sword.
The Royal Family is asking the public not to gather at Windsor Castle or other royal residences, such as Buckingham Palace.