Alpha Protocol - Platform: XBox 360

Veteran class:
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Successfully complete the game under the Recruit class to unlock the
Veteran class, which starts with three skill points in every category
and "Veteran" dialog options.


Bonus weapons:
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Successfully complete the indicated task to unlock the corresponding
special weapon:

Brayko's SMGs: Kill Brayko.
Brayko's stereo: Spare Brayko.
Gold assault rifle: Sneak up on Al Samad Lieutenant without any
alarms being sounded.
Gold SMG: Assassinate Brajka.
Marburg's pistol: Bait Marburg into fighting to the death in the
museum.
Omen's shotgun: Kill Omen Deng. 


Refilling endurance meter:
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When you have taken endurance damage, go to the inventory screen, and
select "Armor". Re-equip your armor (highlight armor and press A) to
completely refill your endurance meter. Repeat this as many times as
desired. -From: Ezra Rainstein