More foreign troops are being killed in Afghanistan of late than in Iraq as US and NATO forces ramp up against the resurgent Taliban. Today, Defense Secretary Robert Gates extended his "personal regrets" for the collateral deaths of Afghan civilians. Gates made his apology on a surprise trip to Afghanistan. Meeting with President Hamid Karzai, he promised the US would try to avoid such mistakes in the future. Anand Gopal is in Kabul for the Christian Science Monitor.