Hunt of Vigilantes
Shortly after the festival incident, ZETA soldiers start paroling the Glades searching for canaries to kill. Later, a soldier that has killed a canary was ambushed by the canaries and stooped by Laurel Lance and his mask was taken by the canaries.
Zeta Soldiers were tasked to arrest the Canaries at their lair but a undercover agent helps them to escape. Later, the canaries would try to destroy the Glades wall but soldier could not arrest them since the Archer program was hacked. Some soldier on top of the Glades Wall, were killed by Mia Smoak when she placed explosives.
The ZETA operation was presumably shut down due to the downfall of Galaxy One and the Glades on his way of a unification.