Here is the ranking information:
Rank 1: No kills-------Private
Rank 2: 5 kills--------Corporal
Rank 3 50 kills -------Sergeant
Rank 4: 100 kills------Master Sergeant
Rank 5: 500kills ------Sergeant Major
Rank 6: 1000 kills-----Knight
Rank 7: 1500 kills-----Knight-Lieutenant
Rank 8: 4000 kills-----Knight-Captain
Rank 9: 7000 kills-----Knight-Champion
Rank 10: 10000 kills---Lieutenant Commander
Rank 11: 15000 kills---Commander
Rank 12: 22000 kills---Marshal
Rank 13: 30000 kills---Field Marshal
Rank 14: 39000 kills---Grand Marshal
(Rank 15 Hidden): 50000 kills (Unknown)
Rank 1: No kills-------Private
Rank 2: 5 kills--------Corporal
Rank 3 50 kills -------Sergeant
Rank 4: 100 kills------Master Sergeant
Rank 5: 500kills ------Sergeant Major
Rank 6: 1000 kills-----Knight
Rank 7: 1500 kills-----Knight-Lieutenant
Rank 8: 4000 kills-----Knight-Captain
Rank 9: 7000 kills-----Knight-Champion
Rank 10: 10000 kills---Lieutenant Commander
Rank 11: 15000 kills---Commander
Rank 12: 22000 kills---Marshal
Rank 13: 30000 kills---Field Marshal
Rank 14: 39000 kills---Grand Marshal
(Rank 15 Hidden): 50000 kills (Unknown)