Are you dying during the mission?
Edit: You do [b]not[/b] have to be in a fireteam, and from my experience, dying will [b]not[/b] allow the ghosts to spawn.
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I have died during falling portions or a *ahem* freak accident with a rocket launcher. I will try that and post results tonight.
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Haha there ya go. Same thing happened to me - had to reset the mission a few times by the Gorgons. Make sure you stay alive, and you'll find everything you need. Let me know how it goes.
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Yep! That worked. Thanks for the help!