- "Killstreak kills count towards your next killstreaks. Only apply to killstreaks earned this life."
- — Create-A-Class description
Kill Chain is a Tier 1 perk in Call of Duty: Modern Warfare. It makes kills done by the user's killstreaks count towards the required kills to earn their next killstreak(s), except the Tactical Nuke. It is unlocked at level 34.
Up to the 1.14.0 Perk rebalancing, this was a Tier 2 perk. It traded slots with Overkill, possibly to allow for better combinations of perks.