Here are the 4 extra ranks that werent included above, there are actually 4 not 3 extra ranks i got that part wrong.
Master Gunnery Sergeant
First Sergeant
Sergeant Major
Now this final rank shouldnt really keep its name, it should be changed to something else probably just to make it look like we arent tied down by just halo games.
Master Chief Petty Officer
This should probably keep some of its original name and maybe just be called Chief Petty Officer (CPO) its a real rank so it counts.
Those 4 ranks continue after the rank of Master Sergeant (Gunnery sergeant grade 4), if any of you dont know what that rank is or looks like the rest of the ranks are above just look for it.