The subject of this article appears in Call of Duty: Modern Warfare (2019)
"Your vision pulses when enemies outside of your view see you."
Create-A-Class description

High Alert is a Tier 2 perk in Call of Duty: Modern Warfare. It triggers a yellow outline around the player's HUD when an enemy outside their view sees them, similar to the Perception trait in Call of Duty: Infinite Warfare. It is unlocked at level 11.

High Alert will also be triggered when an enemy Wheelson, IAV, or Chopper Gunner is targeting the user, but does not warn them from enemies with the Cold-Blooded perk.

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