For A-V(T) we have a term and definition in Naval Abbreviations.

USNR aviaiton officers, former civil aviation pilots or aviators of the Army, Navy, Marine Corps or Coast Guard, qualified for specialist duties. This classificaiton was abolished in September 1944 and replaced by one of the following: (A5), (A5)L, (A6), (A6)L, S(A5), or S(A6).
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