The Queen has paid tribute to the "skill and sacrifice" of the Royal Australian Air Force (RAAF) as she marked its centenary during her first public engagement of the year outside Windsor Castle.
The 100th anniversary of the RAAF was commemorated by the Queen during a service at the Commonwealth War Graves Commission (CWGC) Air Forces Memorial in Runnymede, Surrey, on Wednesday.
In an unscripted moment, the Queen quizzed one Australian serviceman about his work with Typhoon jets and asked if they were "being sent off to chase the Russians" and was told "That's correct, ma'am, it's a lot of fun for us!".
Sending her "best wishes and congratulations" to the RAAF, she wrote in a foreword to the order of service: "As one of the oldest air forces in the world, it is fitting to pay tribute to the efficiency, skill and sacrifice of the men and women who have served in its ranks, in Australia and overseas, during the past 100 years.
"Throughout my reign, the Royal Australian Air Force has shown immense dedication to duty and has defended our freedom in many conflicts around the world."
As she arrived at the memorial, which she opened in 1953, the Queen highlighted how long it was since she had last been there.
She added: "You've got a good day for it. It's a very windy spot normally."
The ceremony began with a flypast by the Red Arrows, but with white smoke only instead of the familiar red, white and blue.
As they do not normally perform at this time of year, their smoke pods are being serviced.
During the service, a wreath was laid on behalf of the Queen by her new equerry, Major Thomas White.
More than 350,000 men and women have served in the RAAF since its formation in 1921, fighting in conflicts ranging from World War II to Korea, Vietnam, Afghanistan and Iraq, with more than 11,100 losing their lives in service.
The event at Runnymede is the fourth royal engagement the Queen has attended beyond the walls of Windsor Castle since the pandemic began.
The Queen has been carrying out her duties as head of state throughout the pandemic and has taken part in a number of memorable virtual royal engagements via video call, including one where she encouraged those who were hesitant to have the vaccine to "think about other people rather than themselves".
Australian High Commissioner George Brandis said in a speech that the RAAF was the second oldest independent air force in the world: "The Royal Australian Air Force has, over these 100 eventful years, grown to be one of the most accomplished in the world."
After the service, the Queen was shown the names of some of the 1383 Australian war dead who are commemorated on a panel.
The Queen was wearing a lime green and ivory dress and jacket by Angela Kelly with matching hat, and the Australian wattle brooch presented to her during her 1954 tour of Australia.
Before she left, she spoke to Brandis about the number of Australians stuck in the UK because of the pandemic.
After he told her of the efforts being made to get them home, she said: "There are worse places to be stuck."
He also spoke to the Queen about the fact that it was her first public engagement of the year and she replied: "I'm delighted to be here."
The Queen was given the promise of a present, to be delivered later when they have been made - two RAAF dog jackets for her new corgi and dorgi dogs.
"That's very kind," she said. "I look forward to it."