She further remembered her father George VI, who became the first member of the Royal Family to qualify as a Royal Air Force pilot.
Princess Diana's favourite flower was the white rose, and the Duchess often likes to pay subtle tribute to Prince William and Harry's late mother through her fashion choices.
The royals will later appear on the balcony of Buckingham Palace to view a flypast of up to 100 RAF aircraft, a parade of more than 1,000 personnel, and a feu de joie to celebrate the junior service's centenary. It will be their first appearance together.
And as such the pretty piece of jewellery was given to the Duchess as a gift on her appointment.More news: Djokovic tops Air K to reach semifinals
They have a jam-packed itinerary in Dublin including meetings with the Taoiseach, Leo Varadkar, and Irish President, Michael D. Higgins, and visits to the likes of Croke Park.
Kate has attended a handful of events tied in with the RAF Cadets.
Prince Louis christening was attended by senior-ranking rankings including Prince Charles and Camilla, Duchess of Cornwall, and Prince Harry and Meghan Markle. The Queen is scheduled to meet President Donald Trump later this week.
On Monday, the Duchess of Cambridge stepped out for Prince Louis' christening.
The family has a long-standing commitment to the Royal Air Force with four generations of the family having served or trained with the United Kingdom's aerial warfare force, and many holding honorary ranks and patronages with RAF charities and associations.
A century later, the RAF is engaged in 13 missions across 26 countries and is heavily committed on operations both at home and overseas, according to Buckingham Palace.