We follow a structured, four-phase engagement model tailored for high-assurance environments: 1) Threat Modeling & Requirements Analysis (1-2 weeks) to define adversarial scenarios and resilience requirements. 2) Architecture & Prototyping (2-3 weeks) to design hardened data pipelines, model architectures, and failover systems. 3) Implementation & Hardening (3-6 weeks) involving adversarial training, secure MLOps pipeline setup, and integration testing. 4) Validation & Deployment (1-2 weeks) including red team exercises using frameworks like MITRE ATLAS and final deployment to accredited environments. All phases include classified data handling per NIST SP 800-171 and DoD IL standards.