After the events of September 11, 2001, the Office of Homeland Security was set up to try to coordinate the antiterrorism efforts of various agencies of the federal government. In 2002, the Homeland Security Act was passed, creating the Department of Homeland Security. Two components of the mission of the Department of Homeland Security as set forth in the act are to “prevent terrorist attacks within the United States and to reduce the vulnerability of the United States to terrorism.” The department evaluates intelligence concerning potential terrorist threats and issues alerts when the danger of terrorist attacks appears to be imminent. In addition, it works with law enforcement and emergency service agencies in the states and cities to help prepare for terrorist threats. Does the mission of the Department of Homeland Security identified above describe the provision of a public good?