Capture the Flag

Summary
Capture the flag, or CTF, is a set of multiplayer rules in Halo 1 and Halo 2 where teams compete to bring a flag, often taken from the opposing teams base, to a pre-determined area, often your team's flag, or base. Many varients of this game type exsist, including one flag CTF, where teams vie for control of one flag, usually centered equidistantly from both teams bases, and attempt to move the flag to one base or the other. More variants can be created using either game's gametype creation system.

Halo Variants
The varients built in with Halo are:
 * CTF
 * Invasion
 * Iron CTF
 * CTF Pro

Halo 2 Variants
The variants included with Halo 2 are:
 * Multi Flag CTF
 * CTF Classic
 * One Flag CTF
 * One Flag CTF Fast

A certain game types from Halo, like invasion that used Capture the Flag rules now have their own rules sub-set in Halo 2 via the Assault rules.