[He grins.] Much as I'd like to turn the Force into a proper military unit, at moments. Suzaku or Lacus are your best bets for joining. You can inquire either on the network or in person.
[With practiced ease, Cain does not shudder or comment on the artificial eyes as he begins answering Gaunt's questions] The one named Venom whom is known to have violent tendencies. Otherwise, you don't have much to worry about. Even the trolls are more like unruly hiveworld teenagers who never benefited from a proper upbringing.
As for psykers, there are... a number of people who don't fit the definition, but aren't easily explained without it. Which makes finding them extraordinarily difficult, but I think we can count that as a double-edged blessing. But if you see a white wolf wearing a communicator, stay alert. She's an ancient goddess incarnated into flesh.