Sergeant Rhea is the initial (a.k.a. Tier I) Freelance Pilot trainer for CorSec Squadron. He is located in the main room of the guild hall at location (-273, -4733), which is 200m west from the Coronet Starport on Corellia. You will need some experience with CorSec before he will accept you as a student. Rhea will give four missions to CorSec Squadron trainees; after completing the fourth mission, pilots will be granted their first skill box.