The Guard of Valdemar is an institution that serves both as military and police force. They guard the borders (Guard posts), city (walls) (garrisons) and towns (Guard houses). They also serve as fire watch. One of their other tasks is to resupply the Heralds waystations. They also serve as the army in time of war.
The color of their uniforms is blue. The palace guards wear midnight blue. Members of the Guard attending classes at the Collegia is what prompted the pale blue uniforms of the Unaffiliated students.