OSLO: President Obama, who earlier arrived in Norway with his wife Michelle, also defended the US record in Afghanistan and his planned surge of 30,000 military personnel as motivated by his desire to bring peace to the war-torn country. In his acceptance speech, he hit back at critics of his plan to begin withdrawing US soldiers from Afghanistan in mid-2011, saying he was “unambiguous” about the date and would debate it no further. But he struck a modest note when he said others may be “more deserving” of the prestigious prize this year