This commentary comes courtesy of Captain Robert A. Newson, CFR’s U.S. Navy fellow and a SEAL officer. CAPT Newson recently served Special Operations Command (Forward) Commander in Yemen 2010-2012, where he helped coordinate military advising efforts in the region. He argues that the reintroduction of U.S. advisory personnel to Iraq does not automatically set the military on a “slippery slope” to full-scale intervention. Rather, the chance of escalation will be determined by three factors: the total required forces, the concept of operations, and any applicable mission restraints. This question will become only more important with late-breaking news of anti-ISIS air strikes’ expansion into Syria.