Firefight: Security Zone is an achievement in Halo 3: ODST. It is obtained by scoring over 200,000 points during a match of Firefight on the Security Zone. It is worth 10 Gamerpoints.

This Achievement is also represented by an olive square with the ONI insignia on it.

When doing this on single player, allow a minimum of 2 hours to reach the 200,000 points.