Key sites in America’s vast missile defense system network are plagued by seawater corrosion, inadequate running water in the bathrooms, poor heating and air conditioning, a lack of storage facilities and other problems, a government watchdog said, pointing to shortfalls in the system at a crucial moment for U.S. national security. The new report from the Government Accountability Office paints a troubling picture of the country’s missile defense system, or MDS, an array of satellites, radars and other tools designed to identify, track and potentially destroy missiles fired at U.S. or allied targets. The health of the MDS is a...