Star Trek Expanded Universe

The Cardassian Third Order was a military unit in the Cardassian Guard.

The Third Order served as Cardassia's rapid response fleet and was spread throughout the Cardassian Union. It had a close relationship with the Fifth Order, which it often planned and executed operations in conjunction with. It saw heavy action in the Dominion War and suffered severely. (The Dominion War Sourcebook: The Fires of Armageddon)

Elements of this Order participated in the attack on Rondac III at the inception of Damar's rebellion. Gul Yaltar is known to belong to this Order. (DS9: "Images in the Sand", DS9: "The Changing Face of Evil") Gul Akellen Macet was also a prominent gul of this Order. (Star Trek: Sigils and Unions--The Thirteenth Order)

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