Hour 2: The killing of Osama bin Laden was big news and rightly so, but what counterterrorism tactics and strategies lead up to the successful raid last May and other victories in the global “war on terror”? We’ll find out this hour with Thom Shanker, a Pentagon correspondent for The New York Times and co-author of the new book “Counterstrike: The Untold Story of America’s Secret Campaign Against Al Qaeda” (Times Books, 2011).