This request is a collaboration with journalist Molly Longman.
A 2017 report from the Government Accountability Office indicates that the Department of Defense and Army maintain records about the numbers, locations, and revenues of slot machines on overseas military installations.
The agency provided a several PDFs indicating revenue, locations and other data for slot machines for the Fiscal Years 2020 through 2024.
To get started with the data, please consult the Data Liberation Project’s introductory documentation.