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STAFFORD, ENGLAND - MARCH 29: Prince William, Duke of Cambridge lays a wreath at the Police memorial at The National Memorial Arboretum on March 29, 2017 in Stafford, England. The opening of the Remembrance Centre follows a major fundraising campaign supported by numerous individuals and organisations, including Staffordshire County Council, the Heritage Lottery Fund and The Royal British Legion. (Photo by Paul Ellis - WPA Pool/Getty Images)

STAFFORD, ENGLAND - MARCH 29: Prince William, Duke of Cambridge lays a wreath at the Police memorial at The National Memorial Arboretum on March 29, 2017 in Stafford, England. The opening of the Remembrance Centre follows a major fundraising campaign supported by numerous individuals and organisations, including Staffordshire County Council, the Heritage Lottery Fund and The Royal British Legion. (Photo by Paul Ellis - WPA Pool/Getty Images)