The Queen is to return to Fife, less than a year after she last visited the kingdom.
The Colonel-in-Chief is due to present a new standard to the Royal Scots Dragoon Guards (Carabiniers and Greys) at Leuchars Station on Thursday, where she will inspect the parade and chat with families of serving personnel.
On the parade ground, she will be met by the Duke of Kent, Deputy Colonel-in-Chief, before prayers and the formal consecration of the new standard before it is officially presented.
The Queen is then expected to make a short speech before a royal salute and regiment march past, and she will view a display of equipment and vehicles ahead of meeting families.
It will be her first public engagement in Fife since September, when she officially opened the new Queensferry Crossing.
On that occasion, the Queen was accompanied by Prince Philip as she cut the ribbon on the £1.35 billion road bridge – exactly 53 years after she opened the Forth Road Bridge.
The Queen last visited Leuchars in September 2015, when she formally renamed the base Waterloo Barracks and met soldiers who had moved into the former RAF base.
The army had taken over control of Leuchars Station in April of that year, with soldiers gradually moving from their base in Germany.
Meanwhile, Prince Edward is also due to visit Fife in the coming days.
The Earl of Wessex will visit the Scouts Scotland National Activity Centre at Fordell Firs at Hillend, and will also visit the Falkland Palace Real Tennis Club is his role as chairman of the board of trustees for the Duke of Edinburgh’s International Award Foundation.
Prince Edward is a keen sportsman and regularly plays real tennis, which is the ancestor of modern lawn tennis played with smaller, wooden rackets and a smaller solid ball.
He also met his wife Sophie at a game of real tennis some years ago.
The earl is expected to round off the day with a dinner at Broomhall House in Charlestown.
It will kick off a busy week for the royals, with the focal point being a garden party at Holyroodhouse on Wednesday and the annual presentation of the Duke of Edinburgh gold awards on Thursday.
Scores of young men and women from across Courier country will converge on the Palace of Holyroodhouse to receive their accolades.
Prince Edward, a trustee of the awards scheme established by his father in 1956, will attend the receptions where a host of celebrities will hand out the certificates to the young people who have successfully completed their awards.