Bonus characters:
Successfully complete the game under the Commander difficulty
setting to unlock new characters on the "Extra" menu. Successfully
complete the game under the Admiral difficulty setting to unlock
Feral.

Captain difficulty setting:
Successfully complete the game under the Commander difficulty
setting.

Admiral difficulty setting:
Successfully complete the game under the Commander difficulty
setting.

All SEAL weapons:
Successfully complete the game under Ensign difficulty setting. You
will also get the 12 gauge pump shotgun and the semi automatic
shotgun.

Songs:
Complete the game under the indicated difficulty setting to unlock
the corresponding song in the Jukebox option.
Beach Bossa: Captain
Brazilicious: Captain.
Contortion: Lieutenant.
Dance Of The Unknown: Lieutenant.
Dark In Your Heart: Captain.
Gnostec: Lieutenant.
Infiltrator: Lieutenant.
Insertion Suite: Lieutenant.
KGM: Lieutenant.
SOCOM II Finale: Captain.
Tari Tari: Lieutenant.

Secret headset commands:
Yell "Intimidate" into the headset while your crosshairs are on the
enemy to make him/her surrender more easily. Your SEAL team will
then yell at the enemy to "Get on your knees!", "Drop your weapon!",
or "Hands in the air!".

In single player mode, say "Able report status" and "Bravo report
status" to hear what your Fireteam is doing.

While fireteam is in hold fire mode, aim at a target and for example
say "Bravo kill target". They will break hold fire only to kill the
target you are aiming at. You can also use "Able kill target". This
works very well if able is carrying a sniper rifle.

Hint: Seeing without night vision goggles:
Adjust the contrast on your screen or your brightness for dark
levels on multi-player and single player levels. This will make
night vision goggles unnecessary. This works very well on Frostfire
and ShadowFalls and can be done in single player mode and online.

If you do not have night vision on dark levels, switch to secondary
weapon and press Up on the D-pad.

Hint: Third person night vision goggles during online play:
Whenever you are in a level that allows you to use night vision
goggles (for example, Shadowfalls, Rats Nest, Desert Glory), you can
eliminate first person night vision goggles. To do this, hold Select
and press Up(2), Back, Up. The night vision goggles will now be
activated, but the view will be in the normal third person. This
makes game play and vision much easier.

Hint: Ammo conservation:
During game play, press on Force Reload(R3) before you run out of
ammo for that clip. The number of clips you have remaining is on the
top right corner of the weapon stat icon. You must have at least one
clip, or you will not be able to "revive" your ammo.

If you are low on ammo, kill someone, then pick up their gun. Pick
yours back up and you will then have full ammo.

Hint: Desert Glory: Easy points:
During online play in Desert Glory or any similar map, when you take
the hostage to the truck, shoot them in the foot as they are
leaving. You will get extra points for your rank.

Hint: Seeding Chaos: Easy sniper rifle:
After meeting with the informant Mallard, go to the largest section
of ruin just past the building that you met him in. There should be
a guard patrolling it and a few boxes of ammunition lying around.
Once at this ruin, turn left so that you are facing towards the road
that connects to the bridge. There should be a small section of
wall, on which a Sr-25 SD is located. Getting this weapon will allow
you to kill the guards and the sniper in the watchtower easier,
which should prevent the alarm from being raised.

Hint: Bonus objectives:
There are many different ways to achieve bonus objectives. In almost
every level, you can complete a bonus objective by listening in on
conversations (for example, in the first level, sneak up and hide in
the bushes from the first two sentries), or there are other ways by
gathering intel, capturing Bosses, recon sentries, or blowing
something up (for example, in the last level, place C4 on the
helicopter).

Glitch: Disappearing rocket:
Take out your rocket launcher. Face it down and launch it. When this
is done, you will not see it blow up on the ground. You will see it
go flying and when you look in that direction it will be gone.

Glitch: Under submarine in Chain Reaction:
In the center of the Chain Reaction level, at the bottom there is a
submarine. There a small path that leads to into the submarine. To
your left or right (depending on which side you entered), there are
some boxes. If you climb them while running into the wall next to
you you will fall onto the floor under the submarine. Note: Do not
walk out of the submarine or you will be trapped