Kill Chain

Kill Chain is a Tier 1 perk featured in Call of Duty: Modern Warfare.
==Call of Duty: Modern Warfare== 
Kill Chain makes kills done by the user's killstreaks count towards the required kills to earn their next killstreak(s), except the Tactical Nuke. The perk only affects killstreaks earned and used in the player's current life, and does not affect killstreaks earned from another player's Care Packages and Emergency Airdrops.
Up to the 1.14.0 Perk rebalancing update, this was a Tier 2 perk. It traded slots with Overkill, possibly to allow for better combinations of perks.
Category:Call of Duty: Modern Warfare (2019) Tier 1 Perks