Tethys
Assault: Rumbler (5% chance)
Distress Beacon
Reward
Commander: Opak (5% chance)
Component: Lithid Beacon (~1% chance)
Caravan
Rewards
Structure: Tesla Field (5% chance)
Component: Hydra Beacon (~1% chance)
Vesper
Reward
Formation: Last Stand (8/28/10) (5% chance)
Remnants
Upgrade: Remnant Capacitor (5% chance)