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Britain's Prince William walks through an interactive light display as he tours the National Memorial Arboretum in Alrewas, central England on March 29, 2017 after opening the new visitors centre. The Police memorial is a blue police lamp taken from Hitchin police station in Hertfordshire. The National Memorial Arboretum, part of The Royal British Legion, is the UK's yearround centre of Remembrance. / AFP PHOTO / POOL / Paul ELLIS (Photo credit should read PAUL ELLIS/AFP/Getty Images)

Britain's Prince William walks through an interactive light display as he tours the National Memorial Arboretum in Alrewas, central England on March 29, 2017 after opening the new visitors centre.
The Police memorial is a blue police lamp taken from Hitchin police station in Hertfordshire. The National Memorial Arboretum, part of The Royal British Legion, is the UK's yearround centre of Remembrance. / AFP PHOTO / POOL / Paul ELLIS        (Photo credit should read PAUL ELLIS/AFP/Getty Images)