Can you still get the security chest in halo reach?
I’m sure it is as it sounds like a generic armor variant but either way, I assure you it’s inconsequential as armor pieces do not affect gameplay in the slightest.
Have a read over the pinned armours thread, you can find all the info there
https://www.halowaypoint.com/en-us/forums/cdecc00475c645b9a4d0a156fb542d59/topics/how-to-get-the-halo-waypoint-armors-for-halo-reach/814418ad-e302-4619-b604-d52ec9d7a69b/posts