I thought the position of Sergeant Major is the highest ranking non-com in a military unit larger than a company such as a military base or command? Sergeant Major is a E-9 while a First Sergeant is a E-8. Also, there is a rank of Sergeant Major for the Army in which he's the highest ranking non-com in the Army and I think it's the same for the Marines and Air Force. I thought those three guys are stationed at the Pentagon, but I might be wrong about that.
Crawdaddy