mos.directory

Air Force · AFSC history

551X1 Construction Equipment Operator

AFSC 551X1 (Construction Equipment Operator) appears to have been combined with 551X0 into AFSC 3E2X1 (Pavements and Construction Equipment Operator) during the 1993 restructuring.

Search legacy codes Browse Air Force specialties

Codes named in this history

Listed in today's directory

These codes have directory pages; their current use has not been reviewed, so no current claim is made here.

Documented history

Construction Equipment Operator

31 October 1993 is the stated creation date of 3E2X1. May 1996 is the report's publication date, not the change date.

  • The consolidation is inferred from the report's comparisons with the two predecessor specialties; the creation statement does not explicitly name both predecessor codes.
Source extraction notes

The official report states AFSC 3E2X1 was created on 31 October 1993 during restructuring and compares it with the predecessor 551X0/551X1 ladders, evidencing their consolidation. Confidence: medium because the conversion sentence says 'this AFSC' rather than listing both predecessor codes inline.

Source documents (1)

Reviewed September 23, 2026 against references 1 and 2.

Construction Equipment Operator

At the 9-skill level, the Construction Equipment Operator career ladder (551X1) merged with the Pavements Maintenance Specialist ladder (551X0) into AFSC 55199, Pavements and Construction Equipment Superintendent.

The report dated August 1, 1982 describes AFSC 55199 as already in use but does not give the merger’s effective date.

  • This does not establish that 551X1 was replaced at lower skill levels.
Source extraction notes

Source-stated predecessor pattern preserved; merger applies at the 9-skill level.

Source documents (1)

Reviewed September 23, 2026 against references 1 and 2.

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