Matt Duss on how the lessons al-Qaeda learned in Iraq are informing the next generation of fighters: One of the key developments leading to the decline in violence in Iraq was the creation and deputization by U.S. forces of Sunni tribal paramilitaries -- many of them former al-Qaeda-affiliated insurgents -- to police their own neighborhoods. Initially referred to as "the Awakening," this phenomenon soon became known as "the Sons of Iraq." But what of the other "sons of Iraq," namely, the thousands of young men from around the Middle East, South Asia, and Europe radicalized by the Iraq invasion and fed a steady stream of images of U.S. occupation by satellite television channels such as Al Jazeera? Many of these men were inspired to travel to Iraq to join in the fight against the American occupation and the U.S.-supported government -- and others who were unable to go have joined with extremist movements in their home countries. One country in which all of these elements -- returning fighters, new tactics, and new technologies perfected in Iraq -- have combined is Yemen, where the government of President Ali Abdullah Saleh is currently threatened by a growing insurgency, led by what many analysts believe to be among the most formidable affiliates of the global jihad movement. KEEP READING ...