For Abdullah Khadr, attending a training camp in Afghanistan where he learned to use a rocket launcher and detonate explosive material at the age of 13 was simply part of the "Muslim culture" there. That's what Khadr, now 28, told an Ontario court Monday when he took the stand for the first time to testify in his effort to fight extradition to the U.S. on terrorism charges. The member of the Khadr clan, Canada's so-called Al Qaeda family, recounted in detail what he did during three months at Khalden camp, which he said was not combat training. "So a 13-year-old...