Article 428-A is a UNSC protocol in effect in 2552. The protocol forbids soldiers from discussing matters related to classified missions with any personnel who do not have the clearance. This includes anyone, even an AI, who questions the soldier or marine before they are debriefed. Violation of this protocol requires the person questioned to report the offense to their superior officer. The penalty for violating this court martialable offense is potentially execution.
- Halo: First Strike (First appearance)