is it possible to get the CQB and Military Police helmet without xbox 360 version of waypoint?
No. You need the Xbox 360 Halo Waypoint App in order to get them. Once you’d unlocked them on there, you can just download them for Xbox One through the Xbox Market for backwards-compatible Reach.
Just follow that link. It will take you to a thread I made that covers everything on how to get all the extra Halo Reach armors and what not.