There is 1 Dead Ghosts to be found in Terrestrial Complex. They can be collected on any mission or during a patrol. Each Ghost can only be collected once per account.
Ghost 1[edit]
Head into the Terrestrial Complex from the Skywatch. Look for the room with the Blue sign with Russian on it:
Head over toward the left, moving slightly to the right. You will see some lockers ahead on the right. The Dead Ghost sits in the right-hand bank of lockers in the one open one: