5907f556_ecrets_for_Xbox_360___GameFAQs__How_to_Unlock
[Unlockable] Mechanic Uniform [How to Unlock] 
In Second Locker on Far Right in Groznjy Grad (Near the locker where you put Major Raikov at)
Metal Gear Solid HD Collection Cheats, Codes, and Secrets for Xbox 360 - GameFAQs