It has been one year since U.S. President Barack Obama commented that the use of chemical weapons in Syria would constitute the crossing of a red line, one that would "change my calculus; that would change my equation." His resolve was first tested this spring, when, after Syrian President Bashar al-Assad allegedly unleashed chemical weapons on his opponents, the White House announced that it would provide small arms to the rebels. A reluctant Congress held up the weapons' delivery, which seemed to put an end to the matter. But now, the Obama administration is being tested once more. As evidence mounts that the Assad regime launched a massive chemical weapons attack last week, Obama can either make a full commitment to get involved in the bloody conflict or decide to stay out of it once and for all. By all appearances, the second option is off the table. Just how far the United States might venture, though, is still up in the air.