lately i have great difficulty in landing even one knife kill with Commando perk. Sometimes my knife doesn't lunge when it's supposed to, sometimes what should be a confirm hit somehow miss, sometimes even when i lunged at him first his gun outbeats me, etc. Now the only reason i put commando perk on is to be able to fall great distances, and with my akimbo G18 and light weight and marathon, i can play the game Unreal or Quake style.