I believe Ames is the guy in the hostage situation with the pacemaker.
If you equip the microphone, and 'Aim' with it, you should hear a bleeping sound when it's in his direction.
If i remember correctly, he is towards the end of one of the rows, is facing down, and has white hair (possibly a blue suit).
Use the microphone and listen for the beeps is the best advice i can give.
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In Metal Gear Solid 2: Sons of Liberty, one can obtain the Heckler & Koch PSG1 sniper rifle by returning to the Strut F Warehouse after meeting up with Richard Ames in the Shell 1 Core. He will have given you a Lvl 3 card, which allows you to open rooms you were unable to enter before. You will find the PSG1 in one of the rooms on the second floor of the warehouse.
The game is Called "Metal Gear Solid 2:Sons of Liberty" So it's the same game.
In Metal Gear Solid 2: Sons of Liberty, you can obtain the Heckler & Koch USP after defeating Olga Gurlukovich in the Tanker chapter. The empty pistol will be lying next to her unconscious body.
metal gear solid 2 theme metal gear peace walker theme calling to the night (portable ops theme) snake eater (metal gear solid 3 theme) father and son theme (metal gear solid 4 end theme)
The 1998 PlayStation game Metal Gear Solid, from Konami, comes on two (2) PlayStation format Compact Discs.