From Halopedia, the Halo wiki
Policy OM-05 SEC-206 AR-52 is a policy prohibiting the use of weapons inside certain areas of a UNSC ship. It was in application aboard some sections of ONI research vessel Argent Moon, notably in the section where a stealth ship was under construction. The policy was deemed obsolete by Blue Team when the Spartans entered the facility and battled their way through Covenant scavengers.
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