US Department of homeland security

The United States Department of Homeland Security (DHS) is a cabinet department of the U.S. federal government with responsibilities in public security, roughly comparable to the interior or home ministries of other countries. Its stated missions involve anti-terrorism, border security, immigration and customs, cyber security, and disaster prevention and management. It was created in November 2002 in response to 9/11 and is the youngest U.S. cabinet department.

From DHS web site:

"The US Department of Homeland Security has a vital mission: to secure the nation from the many threats we face. This requires the dedication of more than 240,000 employees in jobs that range from aviation and border security to emergency response, from cybersecurity analyst to chemical facility inspector. Our duties are wide-ranging, and our goal is clear - keeping America safe."