Official definition of the United States Department of the term critical occupational specialty .
critical occupational specialty
A military occupational specialty selected from among the combat arms in the Army or equivalent military specialties in the Navy,Air Force, or Marine Corps. Equivalent military specialties are those engaged in operational art in order to attain strategic goals in an operational area through the design, organization, and conduct of campaigns and major operations. Critical occupational specialties are designated by the Secretary of Defense. Also called COS. (US DoD)
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