WASHINGTON — Dozens of military installations around the country already are experiencing the impacts of climate change, and rising seas, wildfires and other climate-fueled disasters are likely to cause increasing problems for the armed forces, the Defense Department said Thursday in a report to lawmakers on Capitol Hill.The 22-page document comes in response to a request from Congress in an annual funding bill, which required defense officials to provide a list of the 10 most vulnerable sites that each military branch faces over the next two decades, and an analysis of what could be done to protect them.The document affirms a long-standing sense that the U.S.