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CAMBERLEY, ENGLAND - DECEMBER 16: Camilla, Duchess of Cornwall smiles as she talks to Sandhurst commandant Maj Gen Paul Nanson following her inspection of graduating officer cadets during The Sovereign's Parade at Royal Military Academy Sandhurst on December 16, 2016 in Camberley, England. Today is the first time The Duchess has represented Her Majesty The Queen at the annual event that marks the passing out of Officer Cadets on completion of their Commissioning Course. (Photo by Richard Pohle - Pool / Getty Images)

CAMBERLEY, ENGLAND - DECEMBER 16:  Camilla, Duchess of Cornwall smiles as she talks to Sandhurst commandant Maj Gen Paul Nanson following her inspection of graduating officer cadets during The Sovereign's Parade at Royal Military Academy Sandhurst on December 16, 2016 in Camberley, England.  Today is the first time The Duchess has represented Her Majesty The Queen at the annual event that marks the passing out of Officer Cadets on completion of their Commissioning Course.  (Photo by Richard Pohle - Pool / Getty Images)

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CAMBERLEY, ENGLAND - DECEMBER 16: Camilla, Duchess of Cornwall inspects graduating officer cadets during The Sovereign's Parade at Royal Military Academy Sandhurst on December 16, 2016 in Camberley, England. Today is the first time The Duchess has represented Her Majesty The Queen at the annual event that marks the passing out of Officer Cadets on completion of their Commissioning Course. (Photo by Richard Pohle - Pool / Getty Images)

CAMBERLEY, ENGLAND - DECEMBER 16:  Camilla, Duchess of Cornwall inspects graduating officer cadets during The Sovereign's Parade at Royal Military Academy Sandhurst on December 16, 2016 in Camberley, England.  Today is the first time The Duchess has represented Her Majesty The Queen at the annual event that marks the passing out of Officer Cadets on completion of their Commissioning Course.  (Photo by Richard Pohle - Pool / Getty Images)

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CAMBERLEY, ENGLAND - DECEMBER 16: Camilla, Duchess of Cornwall inspects graduating officer cadets during The Sovereign's Parade at Royal Military Academy Sandhurst on December 16, 2016 in Camberley, England. Today is the first time The Duchess has represented Her Majesty The Queen at the annual event that marks the passing out of Officer Cadets on completion of their Commissioning Course. (Photo by Richard Pohle - Pool / Getty Images)

CAMBERLEY, ENGLAND - DECEMBER 16:  Camilla, Duchess of Cornwall inspects graduating officer cadets during The Sovereign's Parade at Royal Military Academy Sandhurst on December 16, 2016 in Camberley, England.  Today is the first time The Duchess has represented Her Majesty The Queen at the annual event that marks the passing out of Officer Cadets on completion of their Commissioning Course.  (Photo by Richard Pohle - Pool / Getty Images)

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The Duchess of Cornwall at the Royal Military Academy, Sandhurst, Berkshire, where she will represent Queen Elizabeth II at the Sovereign's Parade, which is held at the end of each term at Sandhurst and marks the passing out of Officer Cadets who have completed their Commissioning Course. (Photo by Steve Parsons/PA Images via Getty Images)

The Duchess of Cornwall at the Royal Military Academy, Sandhurst, Berkshire, where she will represent Queen Elizabeth II at the Sovereign's Parade, which is held at the end of each term at Sandhurst and marks the passing out of Officer Cadets who have completed their Commissioning Course. (Photo by Steve Parsons/PA Images via Getty Images)

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CAMBERLEY, ENGLAND - DECEMBER 16: Camilla, Duchess of Cornwall attends The Sovereign's Parade at Royal Military Academy Sandhurst on December 16, 2016 in Camberley, England. Today is the first time The Duchess has represented Her Majesty The Queen at the annual event that marks the passing out of Officer Cadets on completion of their Commissioning Course. (Photo by Mark Cuthbert/UK Press via Getty Images)

CAMBERLEY, ENGLAND - DECEMBER 16:  Camilla, Duchess of Cornwall attends The Sovereign's Parade at Royal Military Academy Sandhurst on December 16, 2016 in Camberley, England.  Today is the first time The Duchess has represented Her Majesty The Queen at the annual event that marks the passing out of Officer Cadets on completion of their Commissioning Course.  (Photo by Mark Cuthbert/UK Press via Getty Images)