What is the main mission of the Department of Homeland Security?
user
Well the “main mission” is kind of hard to pin down, since there are a lot of different things that they do.  I think the most basic reason for existence is that there is a significant threat to the American homeland from people, especially terrorists.  But that’s really the most basic point -- their mission is really about national security, which the Department of Homeland Security is a major player in.
assistant
What is the main mission of the Department of Homeland Security?
user
The DHS was created in the immediate aftermath of the 9/11 attacks to help provide national defense against terrorist attacks, especially airborne terrorist attacks on US soil. The DHS includes the intelligence and security agencies like the NSA and the FBI, which are known for their surveillance efforts, and the Department of Defense's U.S. Coast Guard.
assistant
What is the main mission of the Department of Homeland Security?