If you were in the Confederate military and your sleeve and insignia looked like the picture below, what rank were you and what branch of the military did you serve in?
By the shoulder board, I am venturing it is Confederate States Navy Sea Officers Insignia of the rank of Commander. The sleeve kinda threw me a bit...here's the sleeve that I associated with the Commander:
Edit - Commissioned officers in the Confederate Army wore a much more elaborate knotted design on their sleeves, referred to variously as an Austrian or Hungarian knot.