Foxtrot

Foxtrot, or Charlie Foxtrot, is an expression used by Marines, and is part of the level Sierra 117 in Halo 3. A Charlie Foxtrot (or a 'clusterfuck') was originally used in the army in the two World Wars, and is slang that basically means when a group of soldiers screws up (or 'fucks up'), such as if they are unprepared or disorganized on the battle field. In the Halo Universe, it is a phrase used by the UNSC (the expression had presumably carried on throughout the American Army's history) and it means the same as it did in the past. It is also commonly used as an insult towards Covenant forces (when a Covenant member is killed by a Marine, the Marine will often yell out 'Foxtrot!' and repeatedly shoot the body).