An Indianapolis soldier was killed Wednesday when insurgents attacked his unit in Afghanistan, the military confirmed.Sgt. Christopher N. Karch, 23, was killed in Arghandab Valley, Afghanistan, where he was assigned to the 2nd Battalion, 508th Parachute Infantry Regiment, 4th Brigade Combat Team of the 82nd Airborne Division out of Fort Bragg, N.C.On Karch's Facebook page, his father, Pat Karch, told friends of his death."The Army sent two guys to inform me that Chris was in a fire fight and did not make it," he wrote Wednesday evening. "He was a great son and I lost track of how many times I told him I was proud of him."Karch was serving his second tour of duty in Afghanistan and was 20 days from returning home.Friends described him as funny and a great guy on the Facebook page.Karch graduated from Lawrence Central High School in 2005 and joined the Army immediately after. His Facebook page said he was taking classes at the University of Maryland-Baltimore.Pat Karch told 6News he was in Dover, Del., to receive his son's body on Thursday."He had wings tattooed across his back to protect him in case his chute didn't open," Karch said. "Now, I guess he has his own set of wings."