Halo Reach armor?

With Halo 4 out, is it still possible to get the Military Police and the CQB helmets?

> With Halo 4 out, is it still possible to get the Military Police and the CQB helmets?

Its still entirely possible. Just get the required achievements and career milestones, then go on the Waypoint app on Xbox 360 and check if they are unlocked.