12 / 20
Prince William marches with other Sandhurst Military Academy graduates in the Sovereign's parade Friday Dec. 15, 2006. Major General Sebastian Roberts, the general officer commanding the Household Division, who is ultimately William's new boss as he joins the Blues and Royals, said Friday that a deployment to a conflict zone for Prince William could not be ruled in or out.(AP Photo/Lewis Whyld, Pool)

Britain's Prince William

Britain's Prince William, the oldest son of Princess Diana and Prince Charles, turned 31 on June 21. The prince, also known as the Duke of Cambridge, is expecting his first child with wife, Catherine Middleton.