The Fourth Rail's Bill Roggio addresses the criticism that the United States has made Iraq a training ground for foreign terrorists. The claim, according to Roggio, is doubtless correct but also trivial (Our word, not his):
Al Qaeda is pushing fighters into the country, and some of those who leave will impart their knowledge to others and potentially conduct attacks against their home countries. But al Qaeda has been doing this in other countries; in Chechnya, Bosnia, Kosovo, Thailand, the Philippines, Indonesia, Afghanistan and a host of countries throughout the world. Absent Iraq, the jihadis would enter these countries for their training.
Proponents of the Iraq War believe the establishment of democracy in the heart of the Middle East and the accompanying ideological defeat for al Qaeda, the drawing in of senior al Qaeda operatives into the country, the high casualty rates among foreign terrorists, the valuable combat experience and intelligence gained by U.S. forces, the establishment of an Iraqi intelligence agency and security forces hostile to al Qaeda's operations, the exposure of al Qaeda networks outside Iraq, the pressure placed on Syria, Saudi Arabia and Iran, and other benefits far outweigh the negative of potential bleedback by the terrorists fleeing Iraq.
In the course of explaining why the claim that Iraq is a terrorist training ground is of very little moment Roggio mentions that over half of the foreign terrorists who have come to Iraq to fight so far this year have been killed or captured:
In an October 20th press briefing, Major General Rick Lynch reports that 376 foreign fighters had been captured this year, and over 400 killed. The foreigners come from countries that are outside the reach of U.S. forces. With an estimated 150 terrorists entering the country monthly, well over half of the year's total have been killed or captured, an exceedingly high attrition rate. General Lynch also points out that al Qaeda in Iraq's leadership is often of foreign origin. al Qaeda is not in the habit of putting green recruits into leadership positions.
There's much more at the link, including a graphic which breaks down the captured terrorists by nation from whence they came.