US President Barack Obama walks past an honor guard during an official arrival ceremony upon arrival at Parliament House in Canberra, Australia, on November 16, 2011. US President Barack Obama arrived in Australia on a twice-postponed mission to update a 60-year-old security alliance for a new century marked by the rise of China. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)