Frontier Barracks

Frontier Barracks - Cosmic Anomaly
Class 4 Complex Site
NPCs - Hostiles

First Encounter
Sleepless Upholder x1 (Battleship Class - )
Sleepless Preserver x1 (Battleship Class - )

Killing the Sleepless Preserver triggers another spawn.

First Wave
Sleepless Upholder x3 (Battleship Class - )
Awakened Preserver x2 (Cruiser Class - )

Killing the last Sleepless Upholder triggers another spawn.

Second Wave
Emergent Preserver x3 (Frigate Class - )
Awakened Preserver x4 (Cruiser Class - )
Sleepless Preserver x2 (Frigate Class - )

(Source)