Signal flare

The Signal Flare is a common tool used in the Military by the Stationary Guard and the Scouting Legion. The signal flare has a variety of different uses all depending on the mission.

Uses
While the Signal Flare as many uses it main purpose is communication over long distances. The Stationary Guard has used it as a way to inform there higher ranking officers how there mission was going. While the Scouting Legion used the signal flare as a way to to detect and avoid titans.

Ammo
The ammo used depends on the mission at hand. The ammo the Stationary Guard uses is the following:
 * Green - Mission started.
 * Red - Mission failed.
 * Yellow - Mission successful.

The ammo the Scouting Legion uses for the 57th Expedition beyond the walls is the following:


 * Red - Titan spotted.
 * Black - Deviant-type Titan spotted.
 * Purple - An emergency of some kind.
 * Blue - An order to retreat.
 * Green - Change direction of the formation: Fired by the commander in one direction to indicate a change in the direction, and then repeated by the relay soldiers.
 * Yellow - This lets everyone know that the mission has been terminated, be it successfully or failed.