Lightweight

Lightweight is a Tier 2 perk featured in Call of Duty: Modern Warfare 2 and a Tier 1 perk featured in Call of Duty: Black Ops.

Call of Duty: Modern Warfare 2
In Modern Warfare 2, it allows players to move faster. It is available at the start of the multiplayer game, in the First Recon default class, and at level 4 when Create-A-Class is unlocked it is also immediately available.

The perk currently allows players a 7% movement speed increase, following a discovery that the PC Patch 1.06 decreased it from its original 10% speed boost. When upgraded to Pro, after sprinting 30 miles with the perk equipped, users are able to fire their weapons faster after sprinting. It cuts the time between sprinting and firing in half, similar to how Sleight of Hand halves the time taken to aim down the sight. The description, however, on the multiplayer screen states it provides "Faster ADS after sprinting", which is misleading to some players.

Sprinting 30 miles with Lightweight activated completes the Lightweight Pro IV challenge. The Lightweight Pro VI challenge unlocks the Perk picture as an Emblem and also gives the Title "Pathfinder", and is unlocked after sprinting 250 miles with the perk.

Call of Duty: Black Ops
Lightweight returns as a Tier 1 perk in Black Ops. Lightweight increases your movement speed, it is currently unknown exactly how much faster. It's pro effect is no falling damage,like Commando Pro in Modern Warfare 2.

If Lightweight is selected as the Tier 1 perk, the player's character model will appear to be more lightly equipped.

(Each of the Pro Challenges rewards player with 2000 XP for completing them.)
 * Escape Death: Escape death 50 times.
 * Melee Kills: Get 50 melee kills
 * Offense Medal: Get First Blood 20 times.

Modern Warfare 2

 * This perk was seen in the teaser trailer in early 2009 on the sign hanging over the security checkpoint.
 * The icon for this perk is roughly modeled after the winged shoe of the Greek god Hermes.