Sen. Elizabeth Warren (D-Mass.) is aiming at major defense contractors, calling out exorbitant maintenance costs and pushing for a bipartisan law that would grant the U.S. military the legal right to fix its own equipment. The “$47,000” Knob During a recent Senate Armed Services Committee hearing, Warren highlighted a glaring example of taxpayer waste involving Black Hawk helicopters, which are manufactured by Lockheed Martin Corp.'s (NYSE:LMT) Sikorsky. She pointed out that a small navigational