The Princess Royal will take the salute as the Royal Corps of Signals exercises its Freedom of the town of Richmond, North Yorkshire for the first time in 50 years.
The 250 soldiers from 2nd Signal Regiment and 21 Signal Regiment both based in Imphal Barracks, York, 22 Signal Regiment based in Stafford and 30 Signal Regiment from Nuneaton accompanied by members of the Royal Signals Association will enter the Market Place from King Street led by the Band of the Royal Armoured Corps.
Two soldiers will receive their medals from the Princess Royal - one for operational service and one for accumulated campaign service.
The Duchess of Cambridge is suffering from severe morning sickness, the palace has said, after announcing her second pregnancy. The Duchess was admitted to hospital during her first pregnancy when she was carrying Prince George.
A Palace statement said: "As with her first pregnancy, The Duchess is suffering from Hyperemesis Gravidarum. Her Royal Highness will no longer accompany The Duke of Cambridge on their planned engagement in Oxford today. The Duchess is being treated by doctors at Kensington Palace."
The Duke and Duchess of Cambridge are expecting their second child, the Palace has confirmed.
A statement said: "Their Royal Highnesses The Duke and Duchess of Cambridge are very pleased to announce that The Duchess of Cambridge is expecting their second child."
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The Queen and Prince Philip will be visitng Chatsworth House later today. The Royal couple will be greeted by the Duke and Duchess of Devonshire before meeting local food and drink producers as well as representatives of the local Mountain Rescue, Peak Park Ranger Service and Air Ambulance.
Bill Cowling is show director and says it will be a first in more ways than one.
The Great Yorkshire Show starts today celebrating the region's rural heritage. Thousands of visitors, including the Countess of Wessex and the Princess Royal are expected at the three day event, with record entries of livestock.
There'll be spectacular equestrian displays, and a new land train.
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The 93rd birthday of the Duke of Edinburgh will be celebrated in York today when soldiers from the Army's "Yorkshire Gunners" will fire a 21-gun Royal Salute over the River Ouse from Museum Gardens.
The task will be carried out at 12 noon by 5th Regiment Royal Artillery, a Regular Army unit from Catterick.
The Great Yorkshire Show will be welcoming two Royal visitors this year.
HRH The Countess of Wessex and HRH The Princess Royal will attend the event in July.
More than 130 thousand visitors are expected at this years show in Harrogate.