america's poorest communities; from groups of white supremacists to lone wolves, exploring a racist under current in america, and much more. >> woodruff: secretary of defense ash carter and the chairman of the joint chiefs of staff, general joe dunford, spoke this morning at the pentagon about the fight against the islamic state. while hailing operations to kill top isis leaders-- like the one we reported earlier-- they sought to put the longer war in context. >> there's no question that this individual and other individuals we have eliminated have been part of the apparatus of isil to recruit and to motivate foreign fighters, both to return from iraq and syria to countries in europe and elsewhere, and also simply by using the internet and other communications to do so.