Call of Duty: Modern Warfare
- "Reduce the charge time of field upgrades by 40%."
- — Multiplayer Create-A-Class description
- "Reduce revive time by 25%."
- — Warzone Create-A-Class description
Tune Up increases the rate at which Field Upgrades are earned by 40%.
In Call of Duty: Warzone, it reduces revive time by 25%.