The Duke of Edinburgh met Royal Marines in his final solo public engagement before he retires from royal duties.
The 96-year-old announced his retirement in May, after decades of supporting the Queen, as well as attending events for his own charities and organisations.
Prince Philip has completed 22,219 solo engagements since 1952.
Outside Buckingham Palace, he met servicemen who have taken part in a 1,664-mile trek in aid of charity.
As Captain General of the Royal Marines, the duke attended a parade to mark the finale of the 1664 Global Challenge – a series of strength and endurance challenges raising funds and awareness for charity.
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