Our methodology is a rigorous, four-phase process tailored for defense applications. It begins with operational requirement mapping to define precise data needs. We then execute secure data acquisition from approved, vetted sources. The core phase involves multi-layered sanitization using automated PII/PHI scrubbers, manual review by cleared personnel, and differential privacy techniques. Finally, we perform quality assurance and diversity auditing to ensure datasets are balanced, accurate, and free of historical biases. This process is documented and repeatable, ensuring compliance with frameworks like NIST AI RMF.