Hi, I noticed that your US Air Force ranksets http://kuro-rpg.net/?direct=guest_ranks_viewer&id=131 and http://kuro-rpg.net/?direct=guest_ranks_viewer&id=48 have E-7, 8 and 9 wrong. You have the First Sergeant ranks for each. If you go here: http://www.defense.gov/about/insignias/enlisted.aspx you can see the proper insignia for all 5 United States Military Branches (Army, Navy, Air Force, Marines and Coast Guard). You do great work with the military ranks but the Air Force has a complicated structure.
They're great thanks, but you have the E9 ranks mixed up. If you go here: http://www.defense.gov/about/insignias/enlisted.aspx you can find the correct way. I corrected it in my set and they are very nice. I love this set and I use it too, Most notably on my Federation Naval Patrol Sim (As I found the FNP rank set to be uncompleted) http://sparta.dfsims.com.
So you can see where your rank-sets are winding up: I'm using them extensively over at Broadsword, a new sim under construction at http://ucip.org/sims/broadsword/ .
I love what you have currently, and I would be incredibly happy if you ever do a rankset for the US Navy (collar insignia for officers is basically the same as the other services, it'd just be on a...Navy-ish...background, I guess).
Thanks for your work!