Temporary Profile

A temporary profile is used in Halo 2 and Halo 3, for players or users that have not created a profile and wish to play the Multiplayer or the Campaign. When a player without a profile signs into a game, he or she will be asked if they would like the use a temporary profile.

Temporary profiles cannot be saved (and cannot achieve any achievements in Halo 3). When you receive a temporary profile, you are issued a random username and tag. Some examples are "Bozo", "Sausage" and "Caboose".

Trivia

 * Some temporary profile names are possibly referenced by Bungie, such as "Caboose" (which could be a deliberate reference to the popular machinima Red vs Blue).