Rapid technology advances are driving innovative commercial Low Earth Orbit (LEO) satellite communications systems that can deliver global broadband capacity at terrestrial level costs and performance. These systems offer the military communication diversity critical to achieving resilience in contested environments, as well as satisfying the military’s requirements for high capacity data throughput, global coverage, and lower system cost. The Commercially Augmented Space Inter-Networked Operations (CASINO) program office at the United States Air Force Space and Missile Systems Center (SMC) is focused on supporting various proliferated LEO technical demonstrations, performing risk reduction prototyping for proliferated LEO architectural components, and developing concepts of operations and requirements definition for future proliferated LEO operational systems. This paper provides an architectural overview of CASINO’s mesh network interface concepts, including payload-to-spacecraft, spacecraft-to-spacecraft (via OISLs), spacecraft-to-satellite ground stations, satellite ground stations-to-satellite operations center, and satellite operations center-to-payload operations center interfaces. CASINO’s modelling and simulation validates managed data service flexibility in interleaving government space systems with proliferated LEO commercial constellations. Additionally, CASINO assesses key network metrics and prioritization schemes resulting from military satellites interfacing in the commercial constellation. CASINO examines the ground system implications and network solutions pertaining to point and multi-point connectivity. We identify and address challenges associated with operating CASINO’s mesh network, to include encryption, payload tasking, efficient data routing, and managing network data. Our architecture and model supports system-level simulation activities informing DoD, the ADF, and its allies as to latencies and bandwidth availability within the constellation network.