The subject of this article appears in Call of Duty: Modern Warfare (2019)
"Reduce the charge time of field upgrades by 40%."
Create-A-Class description

Tune Up is a Tier 3 perk in Call of Duty: Modern Warfare. It increases the rate at which Field Upgrades are earned by 40%, and is unlocked by default. In Warzone, it reduces revive time by 25%. 

Community content is available under CC-BY-SA unless otherwise noted.