TIKRIT, Iraq - An American civilian contractor was killed Tuesday when a remote-control bomb exploded under the truck he was driving north of Tikrit, the U.S. military said. The contractor was employed by Kellogg Brown & Root, a subsidiary of Halliburton, a Houston-based oilfield-services and construction company. Halliburton, the former company of Vice President Dick Cheney (news - web sites), has major contracts for reconstruction in both Iraq (news - web sites) and Afghanistan (news - web sites). Maj. Brian Luke, of the 4th Infantry Division, said the five- vehicle convoy was traveling from Baghdad when it was attacked. Insurgents...