Hit me up with a pm about your costume questions. I may be able to help in that department.
Ahh yes. I remember that...
So as I said it's was name and number in boot. The Sierra 117 is a code name given to him, not unlike Ghost in CoD. I'm pretty sure this is when the Spartan II were collecting covenant tech. This was before most of the UNSC knew about the Spartan program. The way humanity depeloped the shield for the mjolnir armor was through the use of the jackle arm shields.
So all in all I believe the code names were used from the time the Spartans first got their armor until most of the UNSC knew about them.
That was impressive comrade.........But I must agree with toacrabman....
I just saw your thread i was wondering will you be shooting in and around Chicago and also you should contact leekegan if you need weapons he is the best and canmake or has almost all of them. also if it helps i am int he Chicago area and do private security for filming in the area