Prince William of Wales (William Arthur Philip Louis; born 21 June 1982) is the elder son of Charles, Prince of Wales and Diana, Princess of Wales, and is also the elder brother of Prince Harry. He is second in the line of succession to the British throne and those of each of the other Commonwealth realms. As the son of the Prince of Wales and the grandson of Queen Elizabeth II and Prince Philip, Duke of Edinburgh, Prince William is a member of the British Royal Family. He was the first prince to be born into the immediate royal family since the birth of Prince Edward in 1964. The prince was commissioned as a Lieutenant in the Blues and Royals regiment of the British Army's Household Cavalry in December 2006, where he served together with his younger brother, Prince Harry. Within his regiment, he was known as Cornet William Wales. In April 2008 William earned his wings by completing pilot training at RAF Cranwell. His rank was Flying Officer but he was given the callsign "Billy the Fish" by his fellow pilots, a pun on his title William of Wales which also uses a part of his father's title for his surname. In September 2008, the prince announced he will transfer his Commission from the Army to the Royal Air Force and is to train to be a full-time pilot with the Royal Air Force's Search and Rescue Force (SARF). (via Wikipedia)