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It's not lit up when I select a class. Does this relate to experience points?
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Handy info for multiplayer if you aren't aware:
The multiplayer mode in Call of Duty 4: Modern Warfare includes a character class system that allows players to create custom infantry classes with numerous weapons and perks (special equipment or abilities) to assign to their soldier.
The player can call in UAV reconnaisance scans, air strikes, and attack helicopters by achieving a three-, five-, or seven-enemy kill streaks, respectively.
The five default classes include Assault, Special Ops, Heavy Gunner, Demolitions, and Sniper. Only three of the default classes are available to a first time player; the rest are unlocked as the player gains more experience online and gains higher rank. Create-a-class can be unlocked at level 4; players can name and save up to five custom classes for quick access in multiplayer matches.
Experience Points (XP) are earned by either killing opponents or completing certain objectives, such as defusing the bomb in "Sabotage" or "Search and Destroy" game modes. The amount of XP gained varies depending on the type of match the user is playing. When the user gains enough Experience Points their rank/level increases. The highest attainable level is 55, or the rank of Commander. Upon reaching level 55 the player is rewarded with a Gold Desert Eagle pistol, indicating his Commander status.
Most of the new weapons and perks that players can use to outfit their custom class are unlocked as they gain higher ranks. There are also a number of challenges associated with each weapon that subsequently open up new weapon attachments as players complete them; these include improved weapon sights, camouflage patterns, and magnification scopes. These benefits are unlocked after attaining a certain number of kills or headshots. Completing these challenges also gives the player XP.
At Level 55, the player cannot gain any more XP from the game until they unlock Prestige Mode, a feature only available in the console versions of the game. In Prestige mode, the player can trade in their rank, all unlocked weapons and completed challenges and start over at level 1, in exchange for a special in-game insignia by their name. The player can then rank up and trade in their rank with Prestige mode again, up to ten times, with a different insignia awarded each time. This effectively gives the player 605 total ranks to achieve. Leaderboard stats (kills, deaths, playing time, etc.) are not affected by Prestige mode