Successfully completing the course , William graduated from Sandhurst on 15 December 2006 , the graduation parade being attended by the Queen and the Prince of Wales , along with other members of the Royal Family .
William graduated from the Royal Military Academy Sandhurst on 15 December 2006 ; the graduation parade was attended by the Queen and the Prince of Wales , along with other members of the Royal Family , and William officially received his commission as a lieutenant .