The Washington Post reported Wednesday that U.S. Marines of the 11th Marine Expeditionary Unit (MEU) are now deployed in northern Syria to fight the Islamic State. They are likely proximate to the U.S. rebel ally-held town of Ayn Issa, about 50 kilometers north of the Islamic State capital, Raqqah. This is significant news for five reasons.

First, it shows the final battle for Raqqah is imminent. This deployment is too large to mean nothing. With more than 2,100 Marines in complement, each MEU is also endowed with tanks, around 20 helicopters (including Ospreys), close air support jets, and armored assault vehicles. An MEU, in short, really packs a punch. The Pentagon would never amass such military power unless for something significant. That something, as I noted recently, is the seizure of Raqqa.