Jill Lawless, The Associated Press LONDON (AP) -- Britain put on a display of birthday pageantry Saturday for King Charles III, a military parade that marked the Princess of Wales ' first public appearance since her cancer diagnosis early this year. The annual event was also a show of stability by the monarchy after months in which both the king and Kate, wife of heir to the throne Prince William, have been sidelined by cancer treatment. In a symbolic display of unity, Charles, Queen Camilla, William, Kate and their children were joined by other members of the royal family on...