LARK HILL, ENGLAND - MAY 26:  Queen Elizabeth II, Captain-General of the Royal Regiment of Artillery, oversees a Royal Review on the occasion of their Tercentenary at Knighton Down on May 26, 2016 in Lark Hill, England. Queen Eliabeth II has been Captain-General of the Royal Regiment of Artillery since 6 February 1952.  (Photo by Richard Pohle - WPA Pool /Getty Images)