Watchtower's Fleet is made up of a number of Ship types. Some of these ships the player can eventually learn to pilot and add to their Fleet.
After the player defeats their second Major Array, the next time they Salvage a ship and then speak to Gren he'll unlock the ability to pilot these ships. For more details about Major Arrays, see the Watchtower Monitoring System page.
Below are a list of the ship types Watchtower uses, in order of difficulty.
Pilotable?: N
Pilotable?: Y
Pilotable?: Y
Pilotable?: Y
Pilotable?: N