Colby Barrett went to scout sniper school because that’s where his Marines were headed. Years later, that training took him to a front-line unit in northern Ukraine to shoot alongside one of the war’s most accomplished marksmen.Barrett was commissioned through Navy ROTC in 2000 and spent four years leading infantry and scout sniper Marines from 2000 to 2004. When most of his platoon headed to sniper school, he went with them. It was a “pretty unusual” move for a Marine officer, he told Military Times.The Marine Corps has since trained its final scout snipers and moved sniper training into reconnaissance…