The Thames Valley Air Ambulance has named Sophie, Countess of Wessex, as its new patron.
Her Royal Highness has been a long-standing supporter of the charity - and she opened their new HQ at RAF Benson in 2015.
The Countess has had first-hand knowledge of their work, after being taken to hospital by them in 2001.
The Chief Executive of the charity, Amanda McLean, says the Countess' support is a big boost for them:
"She's been involved in supporting our work for a very long time.
"She opened our new base in 2015 and she visited our new headquarters in November.
"We're funded entirely from public donations, so having the Countess' support raises awareness of that and provides us with support.
"It's also a real boost for our supporters and volunteers."
The Thames Valley Air Ambulance's Chairman, Sir Tim Jenner, said:
"We are delighted that Her Royal Highness The Countess of Wessex has accepted our invitation of Royal Patronage.
"It reflects her long-standing interest in our service and formally recognises how vital our emergency service is to our community.
"With The Countess’ support, we will continue to push the boundaries of advanced pre-hospital care to give our patients the best possible chance of survival and recovery."
The news was also confirmed in a series of posts by the Royal Family's Twitter account.
The Countess of Wessex has today become Patron of the Thames Valley Air Ambulance.@TVAirAmb rapidly respond to the most critically ill patients with cutting-edge emergency medical care across Berkshire, Oxfordshire and Buckinghamshire: https://t.co/RogAtCz9Xg pic.twitter.com/ofZFsCe8KZ— The Royal Family (@RoyalFamily) January 21, 2019