Army · MOS history
Converted to 91H, dated October 1, 2001 by the source.
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.
Recorded successor: 68H Optical Laboratory Specialist, also listed in today's directory
Optical Laboratory Specialist
DA Pam 611-21 Table 10-4 maps predecessor MOSC 42E2 to 91H; source successor entries: 91H OPTICAL LABORATORY SPECIALIST; conversion effective 01 Oct 2001.
1. Table 10-4, PDF p. 264 · source dated 2025
PDF page 264 (opens in a new tab)Historical information is drawn from the sources linked above. Classification dates are not personal service dates. Spot an error? Let us know.