By The Associated Press, AP BILOXI, Miss. (AP) — A civilian contractor working on a U.S. Air Force base in Mississippi was charged with involuntary manslaughter Thursday after he drove his vehicle into four airmen walking on a track, killing one of them, the FBI said. Emmett J. Bennett, 24, of Biloxi also was charged with operation of a vehicle while impaired in the Wednesday accident at Keesler Air Force Base in Biloxi, the FBI said. Bennett was allegedly traveling at a high rate of speed and narrowly avoided an accident with another vehicle when he crossed the northbound lane of a road on base and hit a light pole, FBI spokesperson Brett Carr said in a news release. Bennett's car then hit the airmen, Carr said.