A Chinese company will take charge of sensitive military and battery technology following the Treasury Department’s decision on Tuesday to permit the sale of a U.S. company that was bankrolled with tax dollars to the Shanghai-based Wanxiang firm. The Committee on Foreign Investment in the United States (CFIUS) approved the $256 million sale of A123 Systems’ operation, despite warnings from military insiders and lawmakers on Capitol Hill that the sale presents a danger to national security. A123 Systems, which went bankrupt despite the Obama administrations’ $249 million in green energy funding to produce advanced lithium ion batteries, controls 91 patents...