because you need to be fit to be able to run forever
most likely from the scavenger pro
you get extra mags as you get in modern warfare 2,too.
use the perk 'warlord' or 'warlord pro' to get multiple attachments.
Marathon Man - Unlimited SprintMarathon Man Pro - Unlimited Sprint + Climb obstacles faster
Highlight the perk, press square (or whatever button for your console) and read about the challenges required.
Let's you run longer.
Get first blood 10 times, run 26.2 miles, and capture the flag 10 times.
run with it on for 26 miles
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
Sprint 26 Miles using Marathon. It's misleading on the description because it says 'run' not 'sprint' like it says for the Lightweight Pro description.
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
Without Pro, you recover ammo from dead soldiers. With Pro, you get extra ammo.
change weapons faster
Flak jacket pro will protect you from explosions and Fire!
how you get hacker pro is by completeing all the challenges
This is my personal favorite: AK-47 Extended Mags Python Speed Reloader Semtex Concussion Grenades Claymore Scavenger Pro Sleight Of Hand Pro Marathon Pro Killstreaks: 8-Blackbird 9-Chopper Gunner 11-Attack Dogs