Call of Duty Engine

[Boyobmas]

The game engine used for the Call of Duty series (called the IW engine) is and is still today just a highly modified version of the Quake III engine.
http://en.m.wikipedia.org/wiki/IW_engine
(And yes, Advanced Warfare uses it too, though the chart on the Wikipedia page doesn't mention it)

[Psychospacecow]

I could be wrong but I think normal wiki can't be used. Great find though.

[Kakariko Kid]

I've used wiki as a source, but I've also backed it with other sources also. Wiki lead me to looking for all the information I found on the latest Battletoads trivia, but I made sure that I included other sources and images.

[Boyobmas]

Here's more links if you need more proof:
http://www.youtube.com/watch?v=4QIK84JwMUY
http://www.gamespot.com/forums/system-wa...-29395281/
http://kotaku.com/next-gen-call-of-duty-...-509622298