Fun with guards
When dressing up as Major Raikov, you can get away with hitting enemies etc and they won't touch you. PLUS, you can also trigger the alert alarm by pressing triangle near one of the red alarm stations, this will send two or more guards to your area, where you can beat them unconscious and take any items they may be holding.
We have more cheats and tips for this game here, Metal Gear Solid 3: Snake Eater cheats
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