WW2 AAC Civilian Flying Instructor photograph

This civilian flying instructor for the US Army Air Corps (USAAC) is wearing the authorized instructor wings and well as the instructor hat badge.

His collar brass is "R.S.A"-- I would appreciate thoughts on the letters.

He is identified on the back as "Richard Azro Welch" at "Ryan Field, Tuscon Arizona". The photograph was taken in 1943.

Reproduction of this photograph in any form is not authorized.

Thanks for looking,

Scott