Well, I have a different question. What's the difference between a Federal Assistant Surgeon and a Federal Junior Assistant Surgeon in regards to uniform insignia? I'm guessing the Asst Surgeon would normally hold the rank of Captain? And, the Junior Asst Surgeon would hold the rank of 1st Lieutenant? I am interested in knowing, to ensure that the uniform that I wear in my impression would be appropriate. Right now, I am portraying an Assistant Surgeon and wear the Captain shoulder straps, with the "MS" in the center.