In Call of Duty: Modern Warfare 2, at what level are the perks unlocked in Multiplayer?

Question

For example: faster reloading, carrying 2 weapons, unlimited sprinting.

Answer 1

From here:

PERKS - SLOT ONE

• Marathon - Start
• Sleight of Hand - Start
• Scavenger - Lvl 13
• Bling - Lvl 21
• One Man Army - Lvl 45

PERKS - SLOT TWO

• Stopping Power - Start
• Lightweight - Start
• Hardline - Lvl 9
• Cold-Blooded - Lvl 25
• Danger Close - Lvl 33

PERKS - SLOT THREE

• Commando - Start
• Steady Aim - Start
• Scrambler - Lvl 17
• Ninja - Lvl 29
• SitRep - Lvl 37
• Last Stand - Lvl 41

The link also has the descriptions if you can't tell what each perk does based on its name.