Defense Information Systems Network (DISN) Continental United States (CONUS) Fiber Operation and Maintenance (O&M) – Link 39

This solicitation calls for continued Operation & Maintenance (O&M) services for the dark‑fiber component of the Defense Information Systems Network (DISN) across the Continental United States, specifically Link 39. The incumbent contractor, By Light Professional IT Services LLC, will be replaced via a sole‑source award to ensure uninterrupted service while the competitively awarded follow‑on contract is being transitioned. The work includes programmatic, engineering, and technical services required to maintain and operate existing dark‑fiber infrastructure, encompassing routine maintenance, fault remediation, performance monitoring, and coordination with network users. • Provides full‑time O&M support for DISN dark‑fiber (Link 39) in the CONUS region. • Requires engineering, technical, and program management expertise in telecommunications fiber networks. • Award must be made by 30 Nov 2026 to avoid service lapse; response deadline 11 Nov 2026.