Moore gained international fame in April when he raised over $37 million for front-line National Health Service workers in the U.K.

Moore originally aimed to raise $1,000 for charity by walking laps in his garden while under lockdown in Buckinghamshire, England. He hoped to complete 100 laps before he turned 100 in late April.

Happy 72nd Birthday @NHS
Thank you for all that you do for us 💙👏 #ThankYouTogether #NHSBirthday#TomorrowWillBeAGoodDay pic.twitter.com/gYGVmXe7jp

— Captain Tom Moore (@captaintommoore) July 5, 2020

Moore's online campaign exploded and by the time he reached his 100th birthday on April 30, the World War II veteran had raised tens of millions of dollars.

Moore also received a promotion from Queen Elizabeth to the rank of colonel and a special flyover to commemorate his achievements.

Just received a rather special birthday card from Her Majesty The Queen @RoyalFamily pic.twitter.com/jqIxpVFBRH

— Captain Tom Moore (@captaintommoore) April 30, 2020

Friday marked a busy day for Queen Elizabeth, who attended the wedding of her granddaughter, Princess Beatrice, on the grounds of Windsor Castle before leading the investiture ceremony for Moore.

ABC News' Guy Davies and Julia MacFarlane contributed to this report.

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