Cross-domain solutions (CDS) are designed to protect data as it moves between trust boundaries—but at the tactical edge, traditional detection-based security models often fail. In denied, disrupted, intermittent, and limited (DDIL) environments, signature updates, sandboxing, and centralized inspection cannot keep pace with modern file-based threats. This paper explores why file trust breaks down in forward-deployed operations and how a Zero Trust, prevention-based approach using Content Disarm and Reconstruction (CDR) restores mission assurance. Learn how file-level verification strengthens CDS workflows, supports NSA Raise The Bar principles, and enables secure data sharing across contested environments without sacrificing operational tempo.