The Commander, Air Group (more commonly known as the CAG) is the senior pilot aboard a battlestar and is responsible for all flight operations by its Air Wing. The rank normally held by the CAG is Captain or Major.
Lt. Kara 'Starbuck' Thrace: You're the CAG, act like one.
Captain Lee 'Apollo' Adama: What does that mean?
Lt. Kara 'Starbuck' Thrace: It means that you're still acting like everyone's best friend. We're not friends. You're the CAG! "Be careful out there?" Our job isn't to be careful, it's to shoot fracking Cylons out of the sky! "Good Hunting" is what you say. And one of your idiot pilots is acting like a child and refusing to take her pills. So she either says "Yes, sir" and obeys a direct order, or you smack her in the mouth and drag her sorry ass to sickbay and you make her take those pills!