What are all the maps for Halo 3 ODST firefight?

[Caleb]

ok. i was playing ODST Firefight and noticed there are about 4 or 5 maps for Firefigth u dont have at teh beggining. what are they? the names. person to name all of them gets 10 points.

 

[iTz Pie! YAY!]

Alpha Site: Unlock the ONI Alpha Site achievement.
Chasm Ten : Unlock the Data Hive achievement.
Crater: Unlocked by default.
Last Exit: Unlock the Coastal Highway achievement.
Lost Platoon : Unlock the Uplift Reserve achievement.
Rally Point : Unlocked by default.
Security Zone : Unlocked by default.
Windward : Unlocked by default.