"The Base" - and as such, is supporting to efforts by other groups on a global basis to a greater or lesser extent, dependent on its analysis of each group and its plans. It also was (and probably still is, to a lesser extent) capable of its own direct action operations.
By analogy, AQ can be viewed as waging unconventional warfare in the classic sense of our FMs. A SFOB hinges on its personnel and functions,
not on its location (or locations, which can be multiple - though obviously network-linked). So also AQ. That is COL Robert Jones' concept, which makes sense to me.
As to the 2001 invasion of Astan, two reasons were (1) retribution and reprobation; and (2) specific deterrence[*]. Both reasons would have been satisfied by a complete destruction of the AQ leadership in Astan as we then knew it. That goal was not realized (Tora Bora et al).
The direct action effort against the AQ leadership still persists (separate US command); but has been submerged by the much larger efforts of UN-NATO ("nation-building" and peace enforcement in favor of the Karzai government) and the US FID-SA effort with major combat support (as noted by Bill Moore).
Since AQ (as a "base" of personnel and functions) is a moving target, the linkage between the effort against it, and the much larger Astan efforts, is not very clear to me. I expect I shall be enlightened.
The Taliban, very intentionally on their part, simply got in the way of our direct action efforts against AQ.
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[*]
Specific deterrence deters the individual wrongdoer (you execute the serial killer). That may have no
general deterrence effect on serial killers to be.
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