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The engine Can of Duty uses is effectively a heavily modified quake 3 engine.
By this point it's so modified it may as well be a different thing, but make no mistake it has evolved from the quake 3 engine.
The first 3 or 4 used quake 3 engine for sure, but didn't they switch it at some point?
Edit: nm I found the wiki page on the topic: https://en.m.wikipedia.org/wiki/IW_(game_engine)
Tldr; it's what you said
Half-Life Alyx still has some flickering light code from the original Quake. Couldn't find a good gif that would include Alyx, but here's a couple other games: