Using 11 B as an example.
For a US Army Infantryman serving as a Drill Sergeant, the primary MOS remains 11B (Infantryman), with the Drill Sergeant qualification added as Special Qualification Identifier (SQI) "X".
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Full MOS designator example: 11BXX (or more specifically by skill level, e.g., 11B3X for a Staff Sergeant or 11B4X for a Sergeant First Class). The "X" is inserted as the SQI character in the MOS code.
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This identifies NCOs (typically SGT to SFC) assigned to drill sergeant positions in training units, such as Basic Combat Training (BCT) or One Station Unit Training (OSUT) for infantry.
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Key DetailsPrimary MOS stays 11B: Drill Sergeant is not a standalone MOS but a special duty/qualification. Soldiers keep their base MOS (e.g., 11B for Infantryman) while detailed to drill sergeant roles.
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SQI X (Drill Sergeant): Awarded after completing the Drill Sergeant Course (DSC) at the U.S. Army Training Center, Fort Jackson. It marks personnel qualified for and/or serving in drill sergeant positions.
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Historical/secondary codes: Older references sometimes list Drill Sergeant duty under 00F (MOS Immaterial for certain special assignments), which could appear as a secondary MOS like 00F4B alongside 11B. This is less common now, with SQI X being the standard.
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Drill Sergeant duty is open to various MOSs (not just infantry), but an 11B with SQI X is especially common in infantry OSUT units.
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In practice, on records, awards, or orders, it appears as the base MOS with the X identifier (e.g., "11B3X Drill Sergeant"). The hat and badge are earned through the role, but the MOS code tracks the qualification formally. For official details, refer to DA PAM 611-21 or Chapter 12 of the relevant Army regulation on SQIs/ASIs.