The Duchess of Cambridge has spoken publicly for the first time about how she felt on edge when Prince William was a pilot based at RAF Valley in Anglesey.
Her comments are part of a foreword to a book by three former RAF wives about what it's like to be a serving pilot's other half.
Air Chief Marshal Sir Andrew Pulford issued a glowing endorsement of the Duke of Cambridge's time in the RAF:
The Duke of Cambridge will continue to carry out royal engagements but is not expected to increase his number of public duties.
The second in line to the throne is in a "transitional" year, sources have said, and is considering options for his "public service", an announcement will be made about his decision within the next 12 months.
The Duke of Cambridge has completed his tour as an RAF search and rescue helicopter pilot and left operational service in the Armed Forces, Kensington Palace announced today.
William carried out his last shift on Tuesday and is now working towards expanding his core charitable interests particularly in the field of conservation of endangered species.
The Duchess of Cambridge has made her first public appearance since the birth of her baby as she joined Prince William, starting a charity endurance marathon on Anglesey.
Baby George didn't make the trip, but as his father's time at RAF Valley, and in Wales comes to an end, hundreds of people did turn out to see the couple before they leave Wales for good. Ian Lang reports.
The Duke and Duchess of Cambridge looked relaxed and happy as they shared a joke with runners in Anglesey.
Wearing a tweed jacket and slim black trousers the Kate laughed as she met some of the runners and their families and volunteers before the start of the ultra marathon.
Prince William and the Duchess of Cambridge have arrived in Anglesey to start an ultra marathon, it marks the first time Kate has been on a public engagement since the birth of Prince George.
The Duchess of Cambridge's decision to join her husband at the launch of an ultra-marathon today was a surprise and her attendance was only revealed this morning.
The royal couple have lived on Anglesey for years and have always spoken of their love of the island.
William said a public goodbye a fortnight ago as he confirmed his young family would be leaving their Welsh home and moving "elsewhere" when his posting comes to an end this month, having completed his three-year tour as an RAF search and rescue helicopter pilot based at RAF Valley on Anglesey.
The Duke of Cambridge is making one of his final public engagements on Anglesey as the new father's time on the island comes to an end.
William will be joined by Kate as he starts the gruelling, three-day annual "ultra" marathon run around the coast of the island, known as the Ring O' Fire.
The Duke and Duchess will meet some of the runners and their families and volunteers before the start - but the couple will not be bringing the royal baby.
The annual event is a 135-mile foot race around the rugged coast of Anglesey, staged over three days and including 13,695 feet of ascent.
The last time the Duchess was seen in public was the day after the birth of Prince George.
The Duke of Cambridge will start the Ring O'Fire Anglesey Coastal Ultra Marathon on Anglesey later. The Ultra Marathon is an annual 135 mile coastal marathon circumnavigating the Isle of Anglesey. The foot race is staged over three days and follows the Anglesey Coastal Path around the island.
Prince William will meet a number of runners and their families and a selection of volunteers involved in the administration of the race before officially starting the Ultra Marathon.
The 135 mile distance and 13,695 feet of vertical ascent makes the Ring O' Fire one of the most extreme ultra marathons in the United Kingdom.