User blog comment:BUDMAKESMEWIZER/10th Prestige Emblem?/@comment-1699685-20091208172340

under the last section, prestige challenges. "Get 1000 kills with an AC-130." note: this is only unlocked after the first prestige. http://callofduty.wikia.com/wiki/Call_of_Duty:_Modern_Warfare_2_Challenges