Federal Tactical Teams: Characteristics, Training, Deployments, and Inventory, Report to Congressional Requesters [open pdf - 7MB]
From the Highlights: "Many federal agencies employ law enforcement officers to carry out the agency's law enforcement mission and maintain the security of federal property, employees, and the public. Some of these agencies have specialized law enforcement teams-- referred to as federal tactical teams in this report--whose members are selected, trained, equipped, and assigned to prevent and resolve critical incidents involving a public safety threat that their agency's traditional law enforcement may not otherwise have the capability to resolve. This report provides information on the (1) federal tactical teams and their characteristics; (2) training team members receive; (3) deployments of such teams from fiscal years 2015 through 2019; and (4) firearms, tactical equipment, and tactical vehicles in team inventories, as of January 2020."
Government Accountability Office: http://www.gao.gov/