Princess Anne From Wikipedia:
"In 2002, she became the first non-reigning woman to attend a funeral in uniform when she wore that of the Royal Navy at the funeral of her grandmother, the Queen Mother."


Honorary military appointments

The Princess Royal on the balcony of Buckingham Palace and in uniform, far right.
The Princess Royal passes behind the Princess Anne Banner at a parade for the 75th anniversary of the Royal Australian Corps of Signals, 5 July 2000.As with other senior royals, Princess Anne holds a number of honorary appointments in the armed forces of several Commonwealth realms. In 2002, she became the first non-reigning woman to attend a funeral in uniform when she wore that of the Royal Navy at the funeral of her grandmother, the Queen Mother.

Anne is of the following regiments, corps, and branches:

Australia
Colonel-in-Chief of the Royal Australian Corps of Signals
Canada
Colonel-in-Chief of the Grey and Simcoe Foresters
Colonel-in-Chief of the 8th Canadian Hussars (Princess Louise's)
Colonel-in-Chief of the Communications and Electronics Branch
Colonel-in-Chief of the Canadian Forces Medical Service[20]
Colonel-in-Chief of the Royal Regina Rifles[21]
Colonel-in-Chief of the Royal Newfoundland Regiment
New Zealand
Colonel-in-Chief of the Royal New Zealand Corps of Signals
Colonel-in-Chief of the Royal New Zealand Army Nursing Corps
United Kingdom
Colonel-in-Chief of the King's Royal Hussars
Colonel-in-Chief of the Worcestershire and Sherwood Foresters Regiment (29/45 Foot)
Colonel-in-Chief of the Royal Corps of Signals
Colonel-in-Chief of the Royal Logistic Corps
Colonel-in-Chief the Royal Army Veterinary Corps
Colonel of the the Blues and Royals
Royal Colonel of the Royal Scots Borderers, 1st Battalion Royal Regiment of Scotland
Royal Colonel of the 52nd Lowland Regiment, 6th Battalion Royal Regiment of Scotland
Royal Honorary Colonel of the University of London OTC
Commandant-in-Chief of the First Aid Nursing Yeomanry (Princess Royal's Volunteer Corps)
Honorary Air Commodore of RAF Lyneham
Honorary Air Commodore of the University of London Air Squadron
Rear Admiral and Chief Commandant for women of the Royal Navy
Commodore-in-Chief of HMNB Portsmouth