Prestige Mode

After a player progresses through Level 55 (Commander), prestige mode can be accessed in the Barracks menu. Prestige mode effectively restarts a player at level 1. All weapon and other challenges will be reset. The player must progress through the ranks to unlock challenges and weapons again. Despite being reverted back to level 1, the player gains a special symbol next to their name indicating they are in Prestige mode. A player can progress through the ranks a total of ten times and enter a new level of prestige mode with a new symbol placed by the player's name.

Pros
The Prestige mode allows players to show skill level beyond level 55. Those players who have progressed through numerous Prestige Modes will have symbols unique by their name. These symbols are usually an indicator of the player's skill since much more play time has been contributed by the player to achieve the prestige rank.

Cons
Prestige mode causes a player to lose all unlocked weapons and completed challenges. If a player's goal is to gain more prestige ranks, there isn't much incentive to completing numerous weapons' and other challenges since they will be reset upon getting through that mode's level 55. There are no Xbox Live achievements connected to online play or specifically getting into prestige mode.