Brad Pitt and his son Pax departed from Seoul, South Korea, today after arriving earlier in the day as part of Brad's promotional efforts for, World War Z, which hits theaters in the US on June 21. Yesterday, the father-son pair visited Sydney, where they rode on a police boat in the harbor. Brad had Pax by his side when the two arrived in Sydney on Saturday following a whirlwind trip across the United States to attend various film showings at five different cities. Brad didn't travel with Pax when he was in the States, but he did have all of his children with him when he celebrated Angelina Jolie's birthday in Germany last week. Angelina was in Europe to support Brad as he premiered World War Z in London, Paris, and Berlin. She made headlines when she walked the red carpet at the film's London premiere, as it was her first public appearance since announcing that she had gotten a preventative double mastectomy.