Outdated U.S. Navy ratings?

Question

My Dad was a "Specialist, Ardtiferous Devices" in the Navy - someone who intially worked on the Navy's "surround sound" visual, 360 degree sight and sound gunner trainer in Lowell, MA during the 1940's. I cannot find out anything about this rate; he said his letters home had his rating as S.A.D. - can't be too many of these characters around anymore; my Dad is 83. Does anyone have any information on this project or rating in the Navy? Please email me if this sounds at all familiar to you. Thank you

Answer 1

The link includes a SAD rating. Good luck!