Guest Stars Tony Curran as Brett Swann Tamala Jones as Gunnery Sergeant Miller Joanna Bacalso as Christine Kristy Swanson as Julia Logan J.B. Tadena as Bayani Larry Bates as Lucas Nance Wayne Péré as Dr. O'Brien Barrett James as Lt. Lawrence Co Starring Tyler Grey as Trent Sawyer Justin Melnick as Brock Reynolds Derek Russo as Sanders AJ DeLeon as Armand Pacada Garrett Goldan as Alpha 2