United States Department of Homeland Security

The United States Department of Homeland Security is also known as the DHS. They are commonly known as Homeland Security. Homeland Security is a Cabinet department of the Federal Government of the United States with the responsibility of protecting the terrority of the United States from terrorist attacks and responding to natural disasters. Its goal is to prepare for, prevent, and respond to domestic emergencies, particulary terrorism.
DHS is the third largest cabinet department in the U.S. federal government after the Department of Denfense and Department of Veterans Affairs. Homeland security policy is coordinated at the White House by the Homeland Security Council. Homeland Security was established on September 20,2001 in response to the September 11, 2001 attacks. President George W. Bush established Homeland Security to coordinate "homeland security" efforts.

http://en.wikipedia.org/wiki/United_States_Department_of_Homeland_Security
http://www.thebestlinks.com/images/0/0e/US-DeptOfHomelandSecurity-Seal.png