From Halopedia, the Halo wiki
Tactical packages are software updates for the MJOLNIR [GEN2] armor that increase a Spartan's combat readiness and responsiveness. They can be accessed through each loadout either before a match is started or during a player's respawn time.
List of packages
The Resistor tactical package was included as part of the Champions Bundle, released in August 2013. As such, it is not available in Spartan Ops. If a player has it equipped in their loadout, it will automatically revert back to "None". Resistor also does not appear in Halo: The Master Chief Collection.