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LONDON, UNITED KINGDOM - MARCH 9: (----EDITORIAL USE ONLY MANDATORY CREDIT - MINISTRY OF DEFENSE OF UNITED KINGDOM / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----) Queen Elizabeth II (L) attends the opening ceremony of Iraq and Afghanistan monument for more than 800 British soldiers, who lost their lives on Iraq and Afghanistan wars in 1990- 2015 in London, United Kingdom on March 9, 2017. (Photo by Ministry of Defense of United Kingdom - Handout/Anadolu Agency/Getty Images)

LONDON, UNITED KINGDOM - MARCH 9:  (----EDITORIAL USE ONLY  MANDATORY CREDIT - MINISTRY OF DEFENSE OF UNITED KINGDOM / HANDOUT" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS----)  Queen Elizabeth II (L) attends the opening ceremony of Iraq and Afghanistan monument for more than 800 British soldiers, who lost their lives on Iraq and Afghanistan wars in 1990- 2015 in London, United Kingdom on March 9, 2017. (Photo by Ministry of Defense of United Kingdom - Handout/Anadolu Agency/Getty Images)