The Department of Homeland Security (DHS) is the primary federal agency responsible for coordinating homeland security efforts in the United States. It was created in 2002 in response to the September 11 attacks.

The Transportation Security Administration (TSA) is responsible for screening passengers and baggage at airports to prevent terrorism and other threats to transportation security.

The Cybersecurity and Infrastructure Security Agency (CISA) is responsible for protecting the nation's critical infrastructure, including energy, water, and transportation systems, from cyberattacks and other threats.

The National Incident Management System (NIMS) is a framework for coordinating emergency response efforts among federal, state, local, and tribal agencies.

Immigration and Customs Enforcement (ICE) is the agency within the Department of Homeland Security responsible for enforcing immigration laws in the United States.

The Secure Flight Program is a risk-based screening program that uses passenger information to identify potential terrorist threats before they board an aircraft.

The Department of Energy (DOE) is responsible for managing the nation's strategic petroleum reserve, which is a stockpile of crude oil that can be used in the event of a supply disruption.

The National Cybersecurity and Communications Integration Center (NCCIC) is a 24/7 center that monitors and responds to cyber threats to the nation's critical infrastructure.

The Environmental Protection Agency (EPA) is responsible for regulating the chemical industry in the United States, including the production, use, and disposal of chemicals.

The National Biodefense Strategy is a comprehensive plan to protect the nation from biological threats, including naturally occurring diseases, bioterrorism, and biowarfare.

The Federal Emergency Management Agency (FEMA) is responsible for coordinating the nation's response to natural disasters, including hurricanes, earthquakes, floods, and wildfires.

The National Disaster Recovery Framework is a guide for federal, state, local, and tribal governments to use in recovering from natural disasters.

The Nuclear Regulatory Commission (NRC) is responsible for regulating the nation's nuclear power plants, including the licensing, construction, and operation of nuclear reactors.

The National Infrastructure Protection Plan (NIPP) is a plan to identify and prioritize critical infrastructure and develop strategies for protecting it from terrorist attacks and other threats.

The Department of Homeland Security (DHS) is responsible for coordinating the nation's response to acts of terrorism, including preventing, detecting, and responding to terrorist attacks.