Your rank equivalents are sooo incorrect.
Centurio (Captain) Sergeant (Remember, a Centurio lead only a Century, which is considered a platoon by modern standards).
Optio (Lieutenant) Corporal.
Aquilifer (Ensign) Simple Standard Bearer/Sort of a corporal, but not quite.
Legate (Colonel) General.
Tribune (Lieutenant-Colonel) Colonel.
Anywho, good luck, Diplex. Seems you're already getting some good attention.