LONDON (AP) — Britain has put on a display of birthday pageantry for King Charles III with a military parade that marked the Princess of Wales’ first public appearance since her cancer diagnosis early this year. Bystanders cheered as Kate joined other members of the royal family on a Buckingham Palace balcony at the end of the King’s Birthday Parade. Kate disclosed in March that she was undergoing chemotherapy for an unspecified form of cancer. The king, who is also being treated for cancer, inspected the troops at Saturday’s event known as Trooping the Color. It’s a spectacle involving 1,400 soldiers, 250 military musicians and more than 200 horses.