By Janine Davidson and Emerson Brooking
On September 22, the air campaign against ISIS expanded into Syria in a coordinated attack that included 47 Tomahawk missiles and nearly 50 coalition aircraft. This action had been all but inevitable since the commencement of overflight reconnaissance in Syria on August 26. Significantly, these strikes also included targets of the Khorasan Group, an al-Qaeda affiliate unrelated to ISIS. Also significantly, five Arab militaries—Bahrain, Saudi Arabia, the United Arab Emirates, Jordan, and Qatar—participated in the operation. At this stage, there are three important questions to address: the targeting of the strikes, the implications of this action, and potential challenges that might await the operation moving forward.