Army · MOS history

51C Structures Specialist

MOS 51C (Structures Specialist) was deleted, with 51B (Carpentry and Masonry Specialist) and 51K (Plumber) listed as its successor specialties.

The directory also lists 51C Contract and Industrial Management. Current service use is not established for this directory entry.

Codes named in this history

Historical steps

The source names a code the branch later retired, or whose reviewed record is historical. Its story continues on that code's own page.

Documented history

Structures Specialist

The listed effective date is October 31, 1986. June 26, 1995 is the publication date of the regulation documenting the change.

  • The record does not specify the conditions for conversion to 51B rather than 51K.
Source extraction notes

AR 611-201 Table B-2 maps deleted MOS 51C to 51B, 51K; source successor entries: 51B Carpentry and Masonry Specialist; 51K Plumber; update/effective date 1986-10-31.

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.