Ranks in the Nigerian air force

These are the ranks in rye air force from the top  to the bottom:
1.Marshall of the air force.
2.Air chief Marshall.
3.Air Marshall.
4.Air vice Marshall
5.Air commodore.
6.Group captain.
7.Wing commander.
8.Squadron leader.
9.Flight lieutenant.
10.Pilot officer.
11.Air warrant officer.
12.Warrant officer one.
13.Warrant officer.
15.Flight sergeant.
16.Sergeant.
17.Corporal.
18.Lance corporal.
19.Air craftsmanship.
That is we have 19 ranks in the nigerian air force.