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The Department of Homeland Security is a cabinet in the United States government, and is called in to advise the President.
It was designed to further counterterrorism goals as CTU does on the show. Never the less, it does appear in both the David Palmer and Charles Logan administrations.
Day 3
David Palmer was advised on how to handle the Cordilla Virus by Joseph O'Laughlin, who was the head of the Department.
Day 4
Homeland Security monitored phone calls after the attack on James Heller and picked up a call between Dina Araz and her son.
Day 5
The department plays a pivotal role in Day 5, when Karen Hayes and Miles Papazian from the DHS take over CTU Los Angeles following a VX Nerve Gas attack that killed nearly 40% of the staff. Many of the people at CTU for the rest of the day were from the DHS, so that Hayes and Papazian would have more control.