CHICAGO — Local and national law enforcement officials are ready for battle ahead of this week’s Democratic National Convention, and their presence is, seemingly, everywhere on the ground and water and in the air. While national party leaders, local officials and the thousands of delegates descending on Chicago are hoping for peace, everyone is braced for violence. A technician adjusts a solar-powered security camera tower outside McCormick Place in Chicago on Aug. 18, 2024. McCormick Place is hosting many of the daytime events associated with the Democratic National Convention. (Dave Levintha…