The Tactical Substrate: Survey of Distributed System Architecture at the C5ISR Edge Under DDIL Conditions

The C5ISR edge is not an extension of the enterprise network — it is a fundamentally different operating environment in which the wide-area link is intermittent by design, blackout windows are the expected envelope, and session-oriented protocols fail structurally. This paper is the survey frame for an eleven-paper undecalogy on edge-degraded operations. The paper argues that the tactical substrate is a distinct architectural species, governed by four mechanisms in compositional layering: Delay-Tolerant Networking (DTN) bundle custody at the transport layer, write-ahead-log replication for durable ordered state at the data layer, Conflict-Free Replicated Data Types (CRDTs) for convergent state merging across disconnected nodes at the coherence layer, and an out-of-path AI Supervisor as the control-plane inference engine that adjusts policy without sitting on the data path. The substrate operates inside a governance envelope specified by the HGC³AE² framework — Human-governed, Curated-Context, Authentication-and-Enforced — developed at the agentic-systems scale and applied here to the distributed-state scale. Forward-references to the nine problem-unpack papers (P3 through P11) develop each mechanism, each operational mode, and each cross-cutting concern at engineering depth. Series: The Implications of Edge Degraded Ops, paper 1 of 11. Companion: HGC³AE² at the Degraded Edge (P2). Parent framework: Mitigating Confident Misalignment in Agentic Systems: The HGC³AE² Framework. This is a v0.1-seed-rev3 — paper-grade rebuild from rev2. The seed deposit timestamps the IP claim while the work continues to develop. Cite the URL or this DOI.