From Halopedia, the Halo wiki
Covert services is involved with covert operations undertaken by UNSC operatives. The branch is comprised of a wide range of personnel, including technicians, analysts, pilots, and surgeons. The work uniforms worn by those in Covert Services are colored royal blue.
During Operation: RETRIBUTION in December of 2553, Covert Services personnel were stationed onboard the Sahara-class heavy prowler, UNSC Silent Joe. They assisted with the planning and execution of certain facets of the operation as its objectives and goals changed in response to new intelligence.
List of appearances