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Britain's Queen Elizabeth II (R) is greeted by Prince Edward, Duke of Kent on arrival at the newly refurbished National Army Museum in central London on March 16, 2017. / AFP PHOTO / POOL / Geoff Pugh (Photo credit should read GEOFF PUGH/AFP via Getty Images)

Britain's Queen Elizabeth II (R) is greeted by Prince Edward, Duke of Kent on arrival at the newly refurbished National Army Museum in central London on March 16, 2017. 

 
 / AFP PHOTO / POOL / Geoff Pugh        (Photo credit should read GEOFF PUGH/AFP via Getty Images)

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Britain's Queen Elizabeth II (L) reacts as Ian Maine, Assistant Director of Collections, shows her her own war uniform (2R), as she attends the opening of the newly refurbished National Army Museum in central London on March 16, 2017. / AFP PHOTO / POOL / Geoff Pugh (Photo credit should read GEOFF PUGH/AFP/Getty Images)

Britain's Queen Elizabeth II (L) reacts as Ian Maine, Assistant Director of Collections, shows her her own war uniform (2R), as she attends the opening of the newly refurbished National Army Museum in central London on March 16, 2017. 

 
 / AFP PHOTO / POOL / Geoff Pugh        (Photo credit should read GEOFF PUGH/AFP/Getty Images)

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Britain's Queen Elizabeth II attends the opening of the newly refurbished National Army Museum in central London on March 16, 2017. / AFP PHOTO / POOL / Geoff Pugh (Photo credit should read GEOFF PUGH/AFP via Getty Images)

Britain's Queen Elizabeth II attends the opening of the newly refurbished National Army Museum in central London on March 16, 2017. 

 
 / AFP PHOTO / POOL / Geoff Pugh        (Photo credit should read GEOFF PUGH/AFP via Getty Images)

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LONDON, ENGLAND - MARCH 16: The daughters of Sergeant Rupert Frere present Queen Elizabeth II with a posey of flowers after the official re-opening the The National Army Museum on March 16, 2017 in London, England. The Museum has undergone a 3 year £23.75 million re-development (Photo by Geoff Pugh - WPA Pool/Getty Images)

LONDON, ENGLAND - MARCH 16:  The daughters of Sergeant Rupert Frere present Queen Elizabeth II with a posey of flowers after the official re-opening the The National Army Museum on March 16, 2017 in London, England.  The Museum has undergone a 3 year  £23.75 million re-development  (Photo by Geoff Pugh - WPA Pool/Getty Images)

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LONDON, ENGLAND - MARCH 16: Queen Elizabeth II waves as she departs after officially re-opening the The National Army Museum on March 16, 2017 in London, England. The Museum has undergone a 3 year £23.75 million re-development (Photo by Geoff Pugh - WPA Pool/Getty Images)

LONDON, ENGLAND - MARCH 16:  Queen Elizabeth II waves as she departs after officially re-opening the The National Army Museum on March 16, 2017 in London, England.  The Museum has undergone a 3 year  £23.75 million re-development  (Photo by Geoff Pugh - WPA Pool/Getty Images)