A West Side man arrested on suspicion of shooting down a Bernalillo County Sheriff's Department helicopter apparently had the skills to do it— he is a former Marine Corps marksmanship instructor who served and was wounded in Afghanistan, court records show. Jason Kerns, 29, who described himself to police as a "sniper" just after the chopper crashed on Aug. 6 on the edge of the Paradise Hills golf course, is a former lance corporal who was honorably discharged from the Marines in 2001. He served as a helicopter mechanic and range coach marksmanship instructor, according to an arrest warrant. Kerns...