The first three I posted on Wednesday, but I'll add them here too for clarity.
You can enter these on the Waypoint App on 360 by pressing X to go to the Classified section and X again to open the Forerunner keyboard, or you can do it online here: halowaypoint.com/classified
1 - 500XP and SPEC/Raider Shoulder Armour [Prerequisite: Complete Spartan Ops Mission 1]
2 - 500XP and Spec/Raider Torso Armour [Prerequisite: Complete Spartan Ops Mission 2]
3 - 5000XP a Concept Art Gallery and ONI Emblem [Prerequisite: Complete Spartan Ops Mission 3]
4 - 2000XP a Concept Art Gallery and Wiseguy Emblem [Prerequisite: Find the Seven campaign Terminals]
5 - 500 XP and SPEC/Raider Helmet [Prerequisite: Enlist in Infinity Multiplayer]
- Cowboy Out.