US President Barack Obama (C) greets Australian Prime Minister Julia Gillard (L) as Governor-General Quentin Bryce (yellow dress) looks as he arrives in Canberra 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 / POOL / Rick Rycroft (Photo credit should read RICK RYCROFT/AFP/Getty Images)