The Yollana Escort Frigate is the original Circasian police ship. This ship was designed to escort the larger, slower freighters traveling through Circasian space. The Yollana was armed heavily for a ship of its time in order to better counter raider forces that had begun to filter into Circasian space and prey on shipping.
The fixed arc particle beams were found to be inadequate for a ship of its type and the Yollana was eventually phased out of service. Those that remained in service during the Chouka War protected the backwater territories of the Empire, including those outposts that were on the edge of known space and distant from other inhabited worlds. By the ak-Tai War the Yollanas had been scrapped.