In this Jan. 31, 2015, file photo, U.S. Marines fire the M777-A2 Howitzer down range during a training exercise at Camp Wilson, Marine Corps Air Ground Combat Center Twentynine Palms, Calif. As Russian forces struggle to gain any traction in their war against Ukraine, the Pentagon has provided Kyiv with 90 top-of-the-line 155mm M777 howitzers to aid in the fight and is running hundreds of Ukrainian troops through special training classes to get them up to speed on the systems. (U.S. Marine Corps photo by Lance Cpl. Aaron S. Patterson/Released) **FILE**
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