Clarence House announced on Thursday morning (12 September) that the Duke of Cambridge has completed his final shift as an RAF search and rescue pilot in Anglesey.
Prince William had served in the military form more than seven and a half years.
A spokesperson for the palace said the royal will now turn his attentions to his charitable duties, and spend the next twelve months working closely with The Royal Foundation of The Duke and Duchess of Cambridge and Prince Harry.
A statement said: "The Duke will continue to work with his charities on issues relating to children and young people, veterans and serving members of the Armed Forces. The Duke is currently considering a number of options for public service, a further announcement on which will follow in due course."
"He is also planning to expand his conservation work, particularly in respect of endangered species."
William's interest in conservation is well known and he is expected to tonight attend the Tusk Trust Awards in London. He is a supporter of the Tusk Trust, which was established to help halt the decline in Africa's natural heritage and protect the interests of people and wildlife alike.
Today, the palace also revealed that William and his wife, Kate, The Duchess of Cambridge, will move into their official residence at Kensington Palace with baby son Prince George within the next few weeks.
William and Kate became first-time parents on 22 July 2013, when Prince George was born at the private Lido Wing at St. Mary's Hospital, Paddington, London.
Kate made her first appearance since leaving hospital at the end of August, joining Prince William at the Ring O' Fire Anglesey Coastal Ultra Marathon.
She is expected to attend tonight's Tusk Trust Awards with her husband.
First pictures of the royal baby in the gallery below: