Stab 50 enemies for Blade veteran (silver title)
Stab 250 enemies for Blademaster (gold title)
get 50 knife kills
Kill 50 enemies with a weapon that has a silencer equipped. Be sure that you are prestiged. Oh, by the way, the title is "Silent Veteran" with no '2' in front of it.
You prestige one and then you get ten knife kills
To unlock Stinger Veteran III, as well as the title (has gold skulls on it), you need to shoot down 2500 helicopters with it.
Stab 50 enemies with your knife. You must be prestiged.
you have to prestige, you get new challenges and then you get 500 or 250 knife kills
1
Reach Prestige 1 and Level 69.
http://www.youtube.com/watch?v=rr5hoXZ0z0Y Is a guide for it.
Complete Flashbang Veteran 1 challenge
Get stabbed by someone who has that title set as his active callsign.
you have to get 250 kills with melee