Is it still possible to get CQB or Military Police armor. If so, how do you get it?
Yes, you can get them. They can be obtained through the Xbox 360 Halo Waypoint App. Each armor/helmet piece has a certain set of requirements to be met in order to unlock the armor/helmet. These requirements are a combination of Achievements and Career Milestone Point across the Halo games. Like one of the things you have to do to get one of the CQB variants is to complete Halo 3 on legendary. I recommend checking the app on Xbox 360 and looking into the requirements for the armor/helmet you want to obtain.
He’s right on point ^, I got my CQB UA/HUL the one where you have to beat 3 and 3 ODST on legendary to get it. I unlocked it in June 2015 and I have worn it every since they, 343 hasn’t update Halo waypoint on the 360 in QUITE some time so you should be all good to go 
Not sure if it is just my crap Aussie internet :), but I get a loading error, I’ll try to post if I can get it/not get it working later…
BTW to find the ‘tab’ in Waypoint;
Go to the home page,
Go left,
Click ‘Waypoint Career’,
Go left again,
Click ‘Halo: Reach Service Record’,
Go left once more,
Find ‘Halo Reach Armor’
Hope this helps, and you don’t have my problem.
P.S I am new to halo waypoint so I I did something wrong just say and fix it in the future 
Yeah it is completely still working, I just have a horrible connection. It turns out I never completed Exodus because I played with my bro and he was always 1st player.
Time to fix that and get the Military Police helmet.
I like how it resembles a marine’s helmet.
> 2533274871484132;3:
> He’s right on point ^, I got my CQB UA/HUL the one where you have to beat 3 and 3 ODST on legendary to get it. I unlocked it in June 2015 and I have worn it every since they, <mark>343 hasn’t update Halo waypoint on the 360 in QUITE some time so you should be all good to go :)</mark>
The app isn’t officially supported any longer, just to note 
People use to have issues with the app not working but like a couple of months ago, it was working just fine for be and I unlocked the last armor from there (CQB helmet variant)
Yes im pretty sure. You need halo waypoint on 360 (its free) and complete the requirements and you will have the armor unlocked.