User blog comment:Callofduty4/Ninja perk./@comment-1627289-20100106094830

I only really use it to counter-act the heart beat sensors and I also use it on my Sniper class (WA2000 Scavenger pro, cold blooded pro and Ninja pro) when I play snowy maps because the footsteps are rather loud, so I use it to stealthy kill anyone that gets too close to me.

It's a cool perk, but annoying how people have it just because it has the word ninja.