Associated Press: A U.S. general is trying to reassure the public the military supports wind power and other alternative energy, despite his concerns that turbines may block radar that detects threats to North America. Air Force Gen. Gene Renuart, head of U.S. Northern Command and the North American Aerospace Defense Command, wrote on his official blog this week that both commands are committed to homeland defense and clean energy. Construction of a 338-turbine wind farm in Oregon has been put …