Fact Sheet: Protecting the Homeland Post September 11: “The Department of Homeland Security (DHS) has taken significant action to improve the nation’s security since the terrorist attacks of September 11, 2001. By improving security measures for the nation’s aviation system, implementing measures designed to protect our critical infrastructure, using biometrics to establish and verify identity, strengthening border security, reflecting the lessons-learned from Hurricane Katrina, increasing the nation’s preparedness for a disaster, and enhancing information sharing among federal, state, local, and international partners, DHS is leading the effort to protect the homeland.”