The parade will mark the end of the 1664 Global Challenge, which raises money for The Royal Marines Charity.
Martin Palmer, a close friend and adviser to the Duke, believes Prince Philip's support for the Queen and his personal contribution to national life should not be underestimated, as behind the scenes he remained head of the family as his wife carried out the role of head of state. He is captain general of the commando force.
The 96-year-old Duke will today take part in a ceremony at Buckingham Palace honouring Royal Marines who have taken part in endurance tests for charity.
Over the past 65 years, Prince Philip has carried out 637 visits overseas on his own and has given nearly 5,500 speeches.
Throughout his career, which started in 1952, Philip has made 22,219 solo engagements and has made 5,496 speeches, noted CNN.
Philip is said to have chose to step away from public life himself and is fully supported by the Queen, Sky News reported.
The royal marines have been a key part of Philip's farewell to official duties.
He was praised at the time for his public service with Prime Minister Theresa May leading the tributes, saying he had given the Queen "steadfast support", while Labour leader Jeremy Corbyn said the Duke's "clear sense of public duty" had inspired people for more than 60 years.
The article coincides with Philip's last public engagement before he retires, which takes place on Wednesday.
The Queen's public schedule will continue as normal.
At 10.28am today, the website uploaded a pre-written piece which had the headline: "HOLD HOLD HOLD Prince Philip, Duke of Edinburgh, dies aged XX".
The Duke will meet some of the runners including two Royal Marines who have completed the entire distance.
It was announced in May that Philip would no longer undertake his own programme of engagements, though he may still accompany the Queen from time to time.