Mark IV armor in h4

Games Other Halo
1

how do i get mark IV armor(or the armor chief had in halo 2 and halo 3)?

or when,do you know which rank i need to reach to see it?

thanks

2

Why do people not understand it’s Mark VI armor?
OT: You get it by beating the campaign on legendary.

3

however i would like to see the Mark IV helmet …