Unlock the following bonuses by reaching the corresponding levels:

BONUS - LEVEL
Create A Class - Level 4
Contracts - Level 5
Clan Tag - Level 6
Game Mode Challenges - Level 8
Killstreaks, Killstreak Challenges, Playercard Emblems - Level 10
Combat Record - Level 13
Medal Challenges - Level 15
Gun Emblems - Level 16
Gun Tag - Level 19
Elite Challenges - Level 20
Camo - Level 22
Custom Reticules - Level 25
Custom Lenses - Level 28
Final Challenges - Level 30
Facepaint - Level 31
Prestige Mode - Level 50
Prestige Leaderboard, Custom Class 6 - Prestige 1
Custom Class 7 - Prestige 3
Custom Class 8 - Prestige 5
Custom Class 9 - Prestige 7
Custom Class 10 - Prestige 9
Face Tattoos - Prestige 11
Clan Tag Colors - Prestige 13
Golden Camo - Prestige 14
Prestige Playlists - Prestige 15