Unlike Call of Duty: Modern Warfare 2, you won't be getting the pro version of a perk by completing a challenge. In Call of Duty: Black Ops you need to complete a set of 3 challenges in order to get the pro version of the perk. These are the challanges you need to complete to get lightweight pro:
The Lightweight pro perk allows you to sprint faster. The lightweight pro perk allows you to aim faster after sprinting.
you get extra mags as you get in modern warfare 2,too.
most likely from the scavenger pro
use the perk 'warlord' or 'warlord pro' to get multiple attachments.
quick aim after sprinting
No falling damage.
In MW2, Lightweight Pro gives you faster Aim Down Sight(ADS) after sprinting In Black Ops, Lightweight Pro gives you no falling damage. Basically Commando Pro is fused with Lightweight.
No falling damage. Basically jump down from any height you won't even be hurt.
be me
Commando Pro, Sleight of Hand Pro, Lightweight Pro, Marathon Pro, Danger Close Pro, Ninja Pro, Scavenger Pro, Last Stand Pro, One Man Army Pro, Steady Aim Pro, Hard line Pro, Cols Blooded Pro, Sit Rep Pro
it means to be a pro at the Black ops job because black ops are special forces that are more of secretive then full out war. They do secret and inportant missions
When you finish the challenge "Lightweight Pro IV" under the "Perks" section, the perk Lightweight upgrades to Lightweight Pro. Lightweight Pro allows the player to raise their weapon more quickly after they stop sprinting.
The Lightweight pro perk allows you to sprint faster. The lightweight pro perk allows you to aim faster after sprinting.
Without Pro, you recover ammo from dead soldiers. With Pro, you get extra ammo.
Let's you run longer.
change weapons faster
how you get hacker pro is by completeing all the challenges