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- COS: Cost of Sales14
- COS: Chief of Staff81
- COS: Chief Of Station4
- COS: Corps Support71
- COS: Corporation Support1
- COs: Commanding Officers4
- COs: Contracting Officers4
- COS: Critical Occupational Specialty43
- COS: Critical Occupational Specialties4
- COS: Civilian Occupational Specialty3
- COS: Critical Operational Specialties1
- COS: Combat Operations Staff4
- COS: Communications Segment4
- Cos: Cosine4
- COS: Company Orderly Sergeant4
- COS: Cadet Officer School4
- COS: Chip on Submount4
- COS: Chief of Supply4
- CoS: Continuum of Service4
- COS: Current Operations Section3