MINDEN, Nev. - A Forest Service-contracted P-2V heavy air tanker dropping retardant on the White Rock Fire crashed in the Hamblin Valley area of western Utah shortly before 1 p.m., Sunday. Both crewmembers were killed. Their names have not been released.The cause of the crash is unknown. The Iron County Sheriff's Office has responded and emergency response teams and an investigation accident team are en route. The P-2V is owned by Neptune Aviation Services, of Missoula, Mont.The lightning-ignited White Rock Fire was first reported shortly before 10 p.m., Friday, in Lincoln County, about 25 miles northeast of Caliente. By Saturday evening, …