Defensive Electronic C3 CM Supt · Converted to 1N691, effective October 31, 1993
AFMAN 36-2108 Attachment 1 maps predecessor AFSC 20990 to AFSC 1N691; the cited table is effective 31 October 1993.
Sources
- AFMAN 36-2108, Airman Classification (Attachment 1, p. 33; table effective 31 Oct 1993)