Resistor Perk not Working?

So, I decided to give Resistor a try for my Spartan Ops loadout (never used it before) and it will not Equip.
I tried modifying the loadout in-game and when I selected Resistor it put in “none” so I backed out and tried it from the main menu. It said equipped then, but when I returned to Spartan Ops it was back to “none”.
It only does it with Resistor.
Anyone else having this problem or know why?

All of the added content doesn’t work in Spartan ops. A detail 343i didn’t mention very prominently.