f7f18077_r_PlayStation_3___GameRankings__Unlockable
[How to Unlock] Scanning Plug S [Unlockable] 
Log more than 10 hours of Metal Gear Online play time on the same profile as your Metal Gear 4 game. You purchase this from Drebin
Metal Gear Solid 4: Guns of the Patriots Cheats, Codes, and Secrets for PlayStation 3 - GameRankings