(FILES) In this file photo taken on August 02, 2017, Britain's Prince Philip, Duke of Edinburgh, in his role as Captain General, Royal Marines, attends a Parade to mark the finale of the 1664 Global Challenge on the Buckingham Palace Forecourt in central London. - Queen Elizabeth II's 99-year-old husband, Prince Philip, has been moved back to a private hospital to recuperate from a heart procedure at a specialist cardiac unit, Buckingham Palace said on March 5, 2021.. (Photo by Yui Mok / POOL / AFP)