Rank 1 (lowest): Pvt. I. As you progress you add two more classes. (Pvt I levels up to Pvt. II.) There is levels I,II, and III in ranks 1-7... Ranks 8-12 have 5 levels; 1* 2* 3* 4* and 5*... Anyways more on that in Part II.
Rank 2: Corporal I,II, and III
Rank 3: Sgt. I,II, and III
Rank 4: Staff Sergant (S.Sgt) I,II,III
Rank 5:Lt. I,II,III
Rank 6:Cpt. I,II,III
Rank 7:Lt.Sgt. I,II,III
This is recruit ranks.