Activision has detailed Call of Duty: Vanguard's first season pass, and the big news is what it calls 'killcam vanities'. Killcams in the context of Call of Duty play briefly after you've been killed, showing how it happened, and at the end of every game all players will see the 'best' multikill of the match replayed—so you can see why players might desire killcam cosmetics.
These are borders that go around killcam replays and, well, they sure do look like Call of Duty cosmetics. The one below
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