Secure Unclassified Network (SUNet) Modernization - Call for Solutions

Amendment 0003: The purpose of this amended CSO call is to adjust the deadline for Solution Brief submissions to Thursday, 05 March 2026 @ 1200 ET, and add clarifying technical details as highlighted in yellow within the document.

Amendment 0002: The purpose of this amended CSO call is to add clarifying language related to the follow-on contract opportunity within section 1.0, as highlighted in yellow within the document.

Amendment 0001: The purpose of this amended CSO call is to correct the email address as highlighted in yellow within the document. Secure Unclassified Network (SUNet) Modernization - Call for Solutions The Department of War (DoW) requires the next generation of its Secure Unclassified Network (SUNet) system.

SUNet is a government owned, secure, unclassified digital environment that enables DoW and mission partners to rapidly experiment with new software and develop Artificial Intelligence and Machine Learning (AI/ML) tools off the Department of Defense Information Network (DoDIN)-- without sacrificing cybersecurity.

SUNet acts as a digital sandbox and provides logically segmented areas of compute and storage resources for DoW and mission partners to collaborate, label data, rapidly onboard, experiment with, develop, and validate emerging AI/ML tools. CDAO is seeking innovative and modernized approaches to the challenge areas listed within this Call for Solutions.

The overall objective is to iteratively develop and demonstrate a next generation SUNet that is optimized for rapid experimentation, development, testing, and validation of AI/ML tools, as well as data labeling, off the DoDIN. See specific requirements within the Call for Solutions, Attachment 1. With this Call for Solutions, the Government is seeking proven, innovative commercial solutions to support the rapid fielding of the modernized SUNet prototype. This Call for Solutions is associated with the Army Open Solicitation (AOS), W9128Z-25-S-A002.