[Lord Sephiroth]

Since it's graal I doubt they're trying to be technical,though I agree it should follow the same guideline.
As far as I know this is the rank list in real life; though correct me if I'm wrong.

Private ---> First Class
Junior Sergeant ---> Sergeant ---> Senior ---> Master Sergeant
Warrent Officer
Junion Luitenant ---> Luitenant ---> Senior ---> Captain
Major
Luitenant Colonel
Colonel
Major General
Lieutenant General
Colonel General
Marshal
Chief Marshal
Admirals