Department of Homeland Security 'Transportation Security Administration' Budget Overview (Fiscal Year 2018 Congressional Justification) [open pdf - 3MB]
From the Component Overview: "The Transportation Security Administration (TSA) is comprised of [various] mission-oriented programs that support achievement of the DHS strategic missions, goals, and objectives. Procurement, Construction, and Improvements programs are indented below the mission-oriented programs they support. Additionally, applicable fees and funds are also indented below the mission-oriented programs to which they most closely align."
U.S. Department of Homeland Security: https://www.dhs.gov/