Hope everyone will get behind #invictusgames. Great opportunity to support and thank the men and women who have given so much. Harry— Invictus Games 2014 (@InvictusLondon) May 15, 2014
The 29-year-old royal typed the message on an iPad at an event at London's BT Tower to promote the Invictus Games, Paralympic-style competitions for injured service members.
"That's why I joined the army -- I can't type fast," he joked, referring to the speed at which he dashed off the message.