From Halopedia, the Halo wiki
Support upgrades are armor mods for the MJOLNIR [GEN2] armor that enhance a Spartan's combat performance in the field. They can be accessed through each loadout before a match is started or during a player's respawn time. While some support upgrades are available since the beginning of the game, others are unlocked via Specializations.
List of upgrades
The Recharge and Survivor upgrades were both added via title update in August 2013. As such they are not available in Spartan Ops. If a player has one of them equipped in their loadout, it will automatically revert back to "None". These upgrades also do not appear in Halo: The Master Chief Collection.