From this website:
https://www.ibiblio.org/hyperwar/USN...29-P1000A.html
A-V(S) -- USNR aviation officers, commissioned and warrant, including gunners, radio electricians, machinists, aerographers, and photographers, qualified for specialist duties. This classification was abolished in September 1944 and replaced by one of the following: (A), (A)L, (D), (D)L, (AD), (S), or S(A).
A-V(T) -- USNR aviation officers, former civil aviation pilots or aviators of the Army, Navy, Marine Corps or Coast Guard, qualified for specialist duties. This classification was abolished in September 1944 and replaced by one of the following: (A5), (A5)L, (A6), (A6)L, S(A5), or S(A6).
Leendert