know the truth about things as they become history, because knowing the future wont be much good if it will change again when you alter it therefore defeating the purpose of knowing what is going to happen, and people will think your crazy if you try to explain and also what is going to happen might be preventing a worse future, but if you know the past you can always input your theory of the event and through further investigation of what you said, the truth will be found and exposed for the world to see.
WYR be a lower rank spartan that does important secret/undercover missions, or a well-known higher ranking soldier that has done less important stuff.