Dan's Little Army that goes off of U.S. Army ranks in this order.

Private
Private 2
Private First Class
Specialist
Corporal
Sergeant
Staff Sergeant
Sergeant First Class
Master Sergeant
First Sergeant
Sergeant Major
Warrant Officer
Cheif Warrant Officer 2
Cheif Warrant Officer 3
Cheif Warrant Officer 4
Cheif Warrant Officer 5
Second Lieutenant
First Lieuteant
Captain
Major
Lieutenant Colonel
Colonel
Brigadier General
Major General
Lieutenant General
General
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If you want to rank up, you have to prove the Generals your worth it and good luck out there.