SOCOM U.S. Navy SEALs: Combined Assault, the video game for the PlayStation 2 that, released on November 7, 2006 in North America
socom combined assault definitely 100%
it is game play similar and runs on the same engine but the story is different
you pick the knife out of your weapon inventory and then you go up to the person you wanna kill and press R1:) you have to be pretty close to them to knife.
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