Select the 'Halo: Waypoint' option at the 'Main' menu to download it to your X360. Start 'Halo: Waypoint' and enter the 'Classified' menu by pressing X, then press X again to access the code input screen. Now enter one of the following secret glyph codes from the image below to unlock the corresponding bonus. Note: you must first find ALL 7 terminals in Campaign missions to use the 'Oni' and 'Wiseguy' codes.
Raider 1: Raider Torso Armour and 500 XP.
Raider 2: Raider Shoulder Armour and 500 XP.
Raider 3 (Raider Helmet): Raider Helmet, Spartan IV Armor: Raider (Artwork), Avatar Award: Raider Helmet and Raider Spartan Emblem, and 500 XP.
Oni 1: Oni Emblem, Halo 4 Concept Art, and 5,000 XP.
Wiseguy: Wiseguy Emblem, Domain Terminals Artwork, and 2,000 XP.