Which federal department is the TSA now included within?

The Transportation Security Administration (TSA) was established in response to the September 11 attacks and is responsible for the security of the nation’s transportation systems, which includes aviation security. This agency was moved under the Department of Homeland Security (DHS) when it was created in 2003 as part of the federal government's reorganization to enhance national security and provide a coordinated approach to domestic security threats.

Being part of the Department of Homeland Security allows the TSA to collaborate closely with other federal agencies focused on national security and emergency response, thereby improving the capability to manage and protect critical infrastructure, including airports and the broader transportation network. The alignment with DHS ensures a more integrated approach to preventing terrorism and responding to security challenges within the aviation sector and beyond.

Other departments such as the Department of Transportation and the Department of Defense do not encompass the TSA’s primary focus or operational scope regarding transportation security. The Department of Commerce, while involved in economic matters and trade, does not address homeland security or transportation security concerns, making the inclusion of TSA in the Department of Homeland Security the most logical choice.