SOCOM 3: U.S. Navy SEALs [PSX]

Admiral difficulty
Complete single player on Captain.

Captain difficulty
Complete single player on Commander.

Front grip
Complete the game on Captain difficulty to unlock the front grip online.

Medium scope
Complete game on Captain.

Scarecrow character skin
If you achieve 24 hours played online in Socom III, the character skin "Scarecrow" is then unlocked and can be used.

Unlock GROM Weapons
Complete game on Captain.

Unlock IW-80 A2
Complete game on Admiral difficulty.

Unlock SBS Weapons
Complete game on Commander.

Unlock SEAL Weapons
Complete game on Ensign.

Unlock STG-77
Complete game on Admiral difficulty.

Unlock Terrorist Weapons
Complete game on Lieutenant.

Multiplayer Characters
North Africa - Al-Kamli Sarwat (Terrorist) - Complete North Africa on any difficulty
North Africa - KILLJOY (Seal) - Training Missions Completed
North Africa - Seal Jungle Ghillie Suit - Complete N.A. on either Commander, Captain, or Admiral
North Africa - Terrorist Jungle Ghillie Suit - Complete N.A. on either Commander, Captain, or Admiral
Poland - COLDKILL (Seal) - Complete Poland on any difficulty
Poland - Dr. Basia Mironova (Terrorist) - Complete Poland on any difficulty
Poland - Seal Winter Ghillie Suit - Complete Poland on either Commander, Captain, or Admiral
Poland - Terrorist Winter Ghillie Suit - Complete Poland on either Commander, Captain, or Admiral
South Asia - CHOPPER (Seal) - Complete South Asia on any difficulty
South Asia - Hari Raman (Terrorist) - Complete S.A. on Captain or Admiral
South Asia - Seal Desert Ghillie Suit - Complete S.A. on either Commander, Captain, or Admiral
South Asia - Terrorist Desert Ghillie Suit - Complete S.A. on either Commander, Captain, or Admiral