FORT BLISS, Texas — US Marines fired so many M777 howitzer rounds in support of Syrian Democratic Forces to oust the terrorist group ISIS from Raqqa that they burned out two barrels. "They fired more rounds in five months in Raqqa, Syria, than any other Marine artillery battalion, or any Marine or Army battalion, since the Vietnam war," Army Sgt. Maj. John Wayne Troxell, a senior enlisted adviser to the chairman of the Joint Chiefs of Staff, told Marine Corps Times at the end of January. "In five months, they fired 35,000 artillery rounds on ISIS targets, killing ISIS fighters by the dozens," Troxell said. http://www.businessinsider.com/m777-howitzer-army-us-marines-photos-2018-3?amp%3Butm_medium=referral Looks like this system is getting a plenty experience chalked up. I wonder what the barrel life actually is on one of these things.