The Department of Defense, specifically the Department of the Air Force, is seeking industry feedback through a Request for Information (RFI) for the Secret Internet Protocol Router (SIPR) Installation Service Node (ISN) Enterprise Modernization program. This initiative aims to upgrade and maintain IT services and infrastructure across the Air Force under an Enterprise Information Technology as-a-Service (EITaaS) model, focusing on the operation, maintenance, and enhancement of SIPR ISN capabilities and base-level infrastructures globally. The RFI invites respondents to share their relevant experience with classified IT network projects and their strategies for compliance with industry best practices in Enterprise Information Technology Service Management. Interested parties should submit their responses to the primary contact, Kyle McCarthy, at kyle.mccarthy.4@us.af.mil by the specified deadline, noting that no funds are available for this inquiry as it serves purely informational purposes.