A North Dakota National Guard soldier killed this week in Afghanistan is being remembered as a soldier and also as a mentor.Forty-one-year-old Sgt. 1st Class Darren Linde of Devils Lake was a full-time instructor at the Camp Grafton Training Center. Fellow instructor 1st Sgt. Kurt Schwind tells the Grand Forks Herald that Linde earned the nicknames "Grandpa" and "Papa Bear" and was proud of the terms of endearment.Linde and 20-year-old Spc. Tyler Orgaard of Bismarck died Monday in a roadside bomb attack. They were serving with the 818th Engineer Company. Orgaard's family planned to make public statements on Thursday.Twenty-three-year-old Spc. Ian Placek was wounded and is in stable condition at a hospital in Germany. The Bismarck Tribune reports he suffered burns to his chest, lungs and legs.