Air Force · AFSC history

1A173G Special Mission Aviator, MH-139 Flight Engineer

AFSC 1A173G, Special Mission Aviator Craftsman, was retitled from “MH-139 Flight Engineer” to “MH-139A Flight Engineer.” The code remained 1A173G; this was a title change, not a replacement specialty.

Codes named in this history

Other history records

These source identifiers have archive pages. Their availability does not establish current service use or retirement.

Documented history

Special Mission Aviator, MH-139 Flight Engineer

The directory identifies 31 October 2025 as the scheduled implementation date for this update.

Source extraction notes

CS&CIG source assertion (not labeled): The AFSC/SFSC is retitled. Conversion instructions: MPS: 4, 5 AFPC: 4, 5, 9 Manpower: 4, 5, 10 The identifier is unchanged; a self-successor records the source-stated occupational retitle.

Source documents (1)

Reviewed September 23, 2026 against references 2 and 3.

Historical information is drawn from the sources linked above. Classification dates are not personal service dates. Spot an error? Let us know.