U.S. Marines fire an M777A2 howitzer in Syria, June 2, 2017. The Marines have been conducting 24-hour, all-weather fire support for the coalition's local partners, the Syrian Democratic Forces, as part of Combined Joint Task Force Operation Inherent Resolve. CJTF-OIR is the global coalition to defeat ISIS in Iraq and Syria. Marine Corps photo by Sgt. Matthew Callahan
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