Until the publication of reports that Bashar Assad’s army carried out a large attack using chemical weapons in an eastern suburb of Damascus, Washington had not seriously considered military intervention in Syria. In light of the conclusion by Western intelligence agencies – reflected in the statement by US Secretary of State John Kerry – that the Assad regime is responsible for using chemical weapons, the US government is considering a military response. A military response, however, does not stand on its own; it obligates the United States to define its strategic purpose in using military force in Syria.