A short paper The Year of the Drone: An Analysis of U.S. Drone Strikes in Pakistan, 2004-2010 by Peter Bergen and Katherine Tiedemann, which appears on: http://counterterrorism.newamerica.n...iedemann_0.pdf

My web access defences inserted the Privoxy Force text, so readers may need to access the website as:http://counterterrorism.newamerica.ne

Within I noted:
In total, between 100 and 150 Westerners are believed to have traveled to the FATA in 2009.25 So far, however, none of these militants has been able to carry out an attack in the West.
The paper concludes:
The drone attacks in the tribal regions seem to remain the only viable option for the United States to take on the militants based there who threaten the lives of Afghans, Pakistanis, and Westerners alike.