Syrian Democratic Forces watch as a coalition airstrike hits its target on a known Islamic State of Iraq and Syria location near the Iraq-Syria border, May 13, 2018. The SDF forces provided security for a coalition mortar team and were postured to offer quick response force services if needed. The strike was in support of Operation Roundup, the offensive to eliminate pockets of ISIS fighters in the Middle Euphrates River Valley in Syria. DoD photo by Army Staff Sgt. Timothy R. Koster