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
