Department of Homeland Security 'Office of the Secretary and Executive Management Operations and Support' (Fiscal Year 2019 Congressional Justification) [open pdf - 1MB]
From the Document: "The Operations and Support (O&S) appropriation funds the Departmental Management Operations Office of the Secretary and Executive Management's operating salaries and expenses. This appropriation provides resources that enable OSEM [Office of the Secretary and Executive Management] offices to provide central leadership, management, direction, and oversight over all of the Department's Components. The nine offices funded by the OSEM include the Office of the Secretary, Office of Policy (PLCY), Office of Public Affairs (OPA), Office of Legislative Affairs (OLA), Office of Partnership and Engagement (OPE), Office of the General Counsel (OGC), Office for Civil Rights and Civil Liberties (CRCL), Office of the Citizenship and Immigration Services Ombudsman (CISOMB), and the Privacy Office (PRIV). The O&S appropriation also provides funding for reimbursable detailees the OSEM provides to DHS Components and other Federal agencies."
U.S. Department of Homeland Security: https://www.dhs.gov/