- Obama steps up military efforts to go after ISIS in Syria as well as Iraq
- Numerous groups of Islamic extremists besides al Qaeda have emerged since 9/11
- Some of them are al Qaeda partners or somehow affiliated with that group
- Others have acted more independently like ISIS, which al Qaeda disowned
(CNN)Even as smoke rose from the World Trade Center, as people clawed through rubble at the Pentagon, there was one name -- and one name only -- synonymous with terror in the United States.