Royal British Legion Festival of Remembrance At The Royal Albert Hall in central London on November 12, 2016.

Queen Elizabeth II and Prince Philip, Duke of Edinburg are greeted as they walk into the ceremony, which this year marks significant anniversaries of key military dates.

Britain's Prince Charles, Prince of Wales and Britain's Camilla, Duchess of Cornwall (L) arrive at the Royal Albert Hall for the annual Royal Festival of Remembrance in central London on November 12, 2016. 

The Duchess of Cambridge arrives at the annual Royal Festival of Remembrance at the Royal Albert Hall in London

Britain's Queen Elizabeth II (R) and Britain's Prince Philip, Duke of Edinburgh (L) in the Royal Box at the Royal Albert Hall during the annual Royal Festival of Remembrance in central London on November 12, 2016. 

Britain's Catherine, Duchess of Cambridge (L) and Britain's Prince William, Duke of Cambridge (R) arrive at the Royal Albert Hall for the annual Royal Festival of Remembrance in central London on November 12, 2016.

Prince William has a quick peek through the program as the Duchess of Cambridge watches on

(L-R) Timothy Laurence, Princess Anne, Princess Royal, Prince Charles, Prince of Wales, Camilla, Duchess of Cornwall and Prince Andrew, Duke of York attend the annual Royal Festival of Remembrance at the Royal Albert Hall on November 12, 2016 in London, England.

Britain's Sophie, Countess of Wessex arrives at the Royal Albert Hall for the annual Royal Festival of Remembrance in central London on November 12, 2016. 

Princess Anne, Princess Royal attends the annual Royal Festival of Remembrance at the Royal Albert Hall on November 12, 2016 in London, England.

Timothy Laurence attends the annual Royal Festival of Remembrance at the Royal Albert Hall on November 12, 2016 in London, England

Princess Alexandra attends the annual Royal Festival of Remembrance at the Royal Albert Hall on November 12, 2016 in London, England.

Prince Richard, Duke of Gloucester attends the annual Royal Festival of Remembrance at the Royal Albert Hall on November 12, 2016 in London, England.

Britain's Catherine, Duchess of Cambridge (L) and Britain's Prince William, Duke of Cambridge in the Royal Box at the Royal Albert Hall during the annual Royal Festival of Remembrance in central London on November 12, 2016.

Britain's Queen Elizabeth II and the Britain's Prince Philip, Duke of Edinburgh (R) arrive at the Royal Albert Hall for the annual Royal Festival of Remembrance in central London on November 12, 2016.

Britain's Queen Elizabeth II (R) and Britain's Prince Philip, Duke of Edinburgh (L) in the Royal Box at the Royal Albert Hall during the annual Royal Festival of Remembrance in central London on November 12, 2016.

Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend the annual Royal Festival of Remembrance at the Royal Albert Hall on November 12, 2016 in London, England.

(L-R) Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge, Prince Edward, Earl of Wessex, Sophie, Countess of Wessex, Princess Alexandra sit with Prince Philip, Duke of Edinburgh and Queen Elizabeth II as they attend the annual Royal Festival of Remembrance at the Royal Albert Hall on November 12, 2016 in London, England.

 British Prime Minister Theresa May (R) stand alongside Prince Andrew, Duke of York (2nd L) and Camilla, Duchess of Cornwall (L) at the annual Royal Festival of Remembrance at the Royal Albert Hall on November 12, 2016 in London, England. 

Britain's Queen Elizabeth II and the Britain's Prince Philip, Duke of Edinburgh (R) arrive at the Royal Albert Hall for the annual Royal Festival of Remembrance in central London on November 12, 2016.

Britain's Prince Edward, Earl of Wessex arrives at the Royal Albert Hall for the annual Royal Festival of Remembrance in central London on November 12, 2016.

Prince Edward, Duke of Kent attends the annual Royal Festival of Remembrance at the Royal Albert Hall on November 12, 2016 in London, England.

Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the annual Royal Festival of Remembrance at the Royal Albert Hall on November 12, 2016 in London, England.

 Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend the annual Royal Festival of Remembrance at the Royal Albert Hall on November 12, 2016 in London, England.

Prince William, Duke of Cambridge attends the annual Royal Festival of Remembrance at the Royal Albert Hall on November 12, 2016 in London, England.

Camilla, Duchess of Cornwall attends the annual Royal Festival of Remembrance at the Royal Albert Hall on November 12, 2016 in London, England.

Catherine, Duchess of Cambridge attends the annual Royal Festival of Remembrance at the Royal Albert Hall on November 12, 2016 in London, England.