HOUSE OVERSIGHT 018211 The third scientist, Dariush Rezaeinejad was shot on July 23, 2011 after picking up his child at a day care; his wife described hearing shots whiz by as she chased the assailants. The most recent assassination was the Jan. 11, 2012 death of Mustafa Ahmadi-Roshan, an expert on uranium enrichment, also by a magnet bomb slapped on his car during his morning commute. By then, Iran was trying to strike back. The task of avenging the scientists fell to the sprawling Quds Force's own covert-operations division, known as Unit 400. It took a shotgun approach, targeting Israeli diplomatic missions in a variety of countries, mostly in the developing world where the global antiterrorism mesh is not so fine. Exposed in Baku, Tbilisi, Johannesburg, Mombasa and Bangkok, the failures mounted at a pace that was itself one of the problems. In the world of espionage, a quality covert operation can take years to pull together. Yet in the 15 months from May 2011 to July 2012, the Quds Force and Hizballah attempted 20 attacks, by the count of Matthew Levitt, a former State Department counterterrorism official. "Hizballah and the Quds Force traded speed for tradecraft and reaped what they sowed," Levitt writes in a January report for the Washington Institute for Near East Policy. "Quds Force planners were stretched thin by the rapid tempo of their new attack plan, and were forced to throw together random teams of operatives who had not trained together." The decline in quality was so striking it initially inspired disbelief Recall the preposterous-sounding plot weaving together a former used-car salesman, Mexico's Zetas drug gang and a bank transfer from a Revolutionary Guard account to assassinate Saudi Arabia's ambassador — by bombing a Washington restaurant? A year on it looks like the new normal. In Bangkok last month, an Iranian agent entered a courtroom in a wheelchair, having accidentally blown his legs off while fleeing police. A