Sources with Britain's Royal Air Force said Princes William and Harry are likely to undergo initiation rituals including streaking and drinking from a toilet. The source said William, who is scheduled to join his new helicopter training squad next month at a Shawbury, England, base, will likely face the base's traditional initiation ritual of drinking beer out of a toilet while comrades dump buckets of ice water over his head, The Sun reported Friday. Meanwhile, Harry, whose training takes place at the Royal Air Force Barkston Heath base, will have to complete the Naked Runway Challenge -- streaking the entire length of the runway -- to earn his drinking wings. No one is forced to take part but I don't know a single person who has chickened out.

LONDON - Prince Charles' wife announced Sunday that she will not attend Princess Diana's memorial service this week after criticism that her presence would be inappropriate.

By RAPHAEL G. SATTER LONDON - Princes William and Harry were on hand at London's Wembley Stadium on Sunday for a star-studded pop concert in memory of their mother, Princess Diana, on what would have been her 46th birthday.

By JILL LAWLESS LONDON - Rockers and royals, including Rod Stewart, Elton John and Princes William and Harry, were taking the stage at London's Wembley Stadium on Sunday to remember Princess Diana almost 10 years after her death in a Paris car crash.