User blog comment:Callofduty4/Ninja perk./@comment-1747467-20100122001033

I use it so I can hear the footsteps of others when I'm sneaking around without my footstep noise covering theirs up. Also, I have been noticed many a time by someone with a HBS when I sneak around without Ninja on. Commando can be more helpful with making an escape, but when you're sneaking in, nothing beats Ninja Pro at making sure no one notices you, even if you weren't spotted directly.