HOUSTON (Reuters) - The U.S. Department of Defense has reversed its decision to fund two projects to process rare earth minerals for military weapons, one of which has controversial ties to China, according to three sources and a government document seen by Reuters.Australia's Lynas Corp and privately held U.S. firm MP Materials both said on April 22 they had been awarded funding by the Pentagon for rare earths separation facilities in California and Texas.The Pentagon decision is a step..