Michael Condrey has confirmed on Twitter today that after each prestige, you will be able to select one item that you will want to have permanently unlocked, similar to MW3.
@tj_holguin not exactly, but you do get to select one item to permanently unlock after prestiging.
— Michael Condrey (@MichaelCondrey) October 6, 2014
Condrey already confirmed earlier that Advanced Warfare will feature 50 levels per each prestige, with a total of 15 prestiges.
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