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Classification is placed on transmissions sent and received by UNSC personnel in order to determine the extent of restriction that is to be placed on the information contained in the transmission. The information can have varying degrees of importance, which can also be determined by the transmission's Encryption Code.


There are several classifications to transmissions, which include:

Classification Description Examples
NA These transmissions are completely unrestricted. They are available for any person to see them who wishes to. ???
  • BGX Directive: Under this directive, it appears a communique should be classified as restricted when officers wish to communicate with one another. As well, sharing of the Cole Protocol falls under the restricted classification, even to broad groups of Navy Personnel.
  • XXX-XD Directive: Under this directive, it appears communique should be rated restricted when a UNSC AI communicates with an officer.[1]
Classified BGX Directive: Under this directive, this classification is also used by military personnel to communicate with one another. More specifically, it is used when one commander wishes to communicate with as many UNSC ships as they can within range while still maintaining a level of secrecy.[2] UNSC Alpha Priority Transmission 04592Z-83
SECRET BGX Directive: Under this directive, this classification is for a higher-level of secrecy. It is designed to be used exclusively when ship captains communicate with one another, or when Admirals wish to communicate with lower ranking ship commanders. ???
MOST SECRET BXG Directive, Cole Directive, General Directive: Under all three of these directives, this classification is used for communication between Senior officers, about SPARTAN deployment.[3] UNSC Priority Transmission 90872H-11
  • RND Directive: Under this directive, it appears to be used when two personnel are discussing any detail of an operation.[4]
  • Section III X-Ray Directive: Used when ONI agents are discussing SPARTANs.
EYES ONLY TOP SECRET SECTION III X-RAY DIRECTIVE: Under this directive, this classification is to ensure that no one is supposed to see the information on the file except the sender and the recipient. It is used exclusively by members of ONI Section Three. PLNB Priority Transmission XX087R-XX


  1. Halo: Ghost of Onyx, page 122
  2. Halo: The Fall of Reach, page 289
  3. Halo: Blood Line Issue 1
  4. Halo: The Fall of Reach 2010 Edition Bonus Content