Hugh Pickens writes "Reuters reports that President Barack Obama has invoked a little-used law to block a privately owned Chinese company from building wind turbines close to a Navy military site in Oregon due to national security concerns. 'There is credible evidence that leads me to believe' that Ralls Corp, Sany Group and the two Sany Group executives who own Ralls 'might take action that threatens to impair the national security of the United States,' said Obama in issuing his decision. The military uses the Oregon naval facility to test unmanned drones and the EA-18G 'Growler.' The electronic warfare aircraft accompanies US fighter bombers on missions and protectively jams enemy radar, destroying them with missiles along the way. At the Oregon site, the planes fly as low as 60 m and at almost 480 km/h. The administration would not say what risks the wind farm purchases presented but the Treasury Department said the Committee on Foreign Investments in the United States, known as CFIUS, made its recommendation to Obama after receiving an analysis of the potential threats from the Office of the Director of National Intelligence. The last time a president used the law to block a transaction was in 1990, when George H.W. Bush voided the sale of an aerospace company, Mamco Manufacturing, to a Chinese agency."