What are some quick ways i can get halo 3 armor?

[Z Dude]

i only have halo odst and i really want the japanese sword and the japanese style armor, i also want any others i can have.

 

[Colloito]

you can only get the hyabusha armor and katana from having the original campaign disc, odst doesnt have the the halo 3 campaign, only the odst campaign, sorry