(In the US Army or Marine Corps) the highest-ranking noncommissioned officer in a company or equivalent unit.
- We assembled drill sergeants, company commanders, and first sergeants and executed leader training on each aspect of the warrior challenge.
- Conditions are further complicated by unit commanders and first sergeants not being full-time and by all having to get caught up during weekend training.
- All command sergeants major, first sergeants and first line leaders of each command are responsible for the program.
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Syllabification: first ser·geant
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