Master sergeant faces court-martialGRAND FORKS (AP) — A master sergeant at Grand Forks Air Force Base is facing a court-martial late this month for alleged dereliction of duty. The attorney for Master Sgt. Lisa Mashburn says she will be exonerated. Base spokesman Master Sgt. Joseph Kapinos said Mashburn is the sergeant in charge of an operations center where an airman committed suicide in early August.