I just found this website while researching the PMEL career field.
When did the Air Force change the AFSC from 324x0 to 2P0x1? I was a 32470 back in 1985. Then I left the military for 21 years. Now I am back in the AF Reserves working in Civil Engineering. Things have changed a bit. . .
Don't know about the Air Corps but the Army changed around the MOS numbers about 2 years ago, from 35H to 94H I think.
It changed while I was in. I think it was '94 or '95.