The latest estimates say that the Assad regime has hundreds of tons of mustard gas, a blister agent, and large stockpiles of sarin and possibly VX, both of which are nerve agents -- all of which can be launched by Scud missiles, artillery, or aircraft, according to Charles Blair, a specialist in chemical and biological weapons at the Federation of American Scientists. "I've heard that Syria has 100 to 200 missiles with nerve agents loaded and ready to go, but that seems extreme," said Blair, noting that the nerve agents are usually stored separately from the weapons and that exact...