Which act established the Homeland Security missions for the Coast Guard?

The Homeland Security Act of 2002 is the legislation that established the Homeland Security missions for the Coast Guard. This act was pivotal because it integrated various federal agencies and functions dedicated to enhancing national security, particularly in response to the events of September 11, 2001. Under this act, the Coast Guard was given expanded roles and responsibilities, particularly in areas such as port security, critical infrastructure protection, and enhancing maritime safety.

This act fundamentally shaped the Coast Guard's modern mission set, reflecting a shift in focus towards securing the nation from threats that could arise through maritime avenues, while still maintaining their traditional roles in search and rescue and law enforcement. The creation of the Department of Homeland Security under this act further reinforced the Coast Guard's role as a key player in the nation's security framework.

The other acts mentioned, while significant in their own rights, deal with different aspects of maritime safety, transportation, or funding mechanisms that do not directly establish Homeland Security missions within the Coast Guard.