Howitzer Blast A Marine fires an M777A2 howitzer in the early morning in Syria, June 3, 2017. Marines were conducting 24-hour all-weather fire support for the coalition's local partners, the Syrian Democratic Forces, to support Combined Joint Task Force Operation Inherent Resolve. Marine Corps photo by Sgt. Matthew Callahan SHARE: Download: Full Size (4.44 MB) Credit: Sgt. Matthew Callahan VIRIN: 170603-M-IN448-058C.JPG Photo Gallery