Heya! As an old Challenger Alum, I'm letting you know we were all transferred in 2388 (Reid took an LOA before he was placed on the Drake, and he was placed there because there was no Challenger to go back to).
Also: Theo Casey and Hannah Martinez were/are PNPCs (Martinez is still active).
Officers off the top of my head (but there's probably a heap more that I don't remember/know about):
- Jesse Lawn (FO with Tel-ar)
- Moran Jatam
- Dero Goi
- Tobias Walker
- Maya Gemini
- Darius Mando