A U.S. Army spokesman says one member of the U.S. Navy was killed and several others injured during a training exercise at the Fort Knox Army post.Fort Knox spokesman Ryan Brus said Friday the accident happened at 9:30 p.m. EDT Wednesday and involved members of a Naval branch at the post in central Kentucky.Brus had no other details and referred calls to U.S. Navy Lt. David Lloyd. Lloyd did not immediately return a call to The Associated Press.