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See service authority.
CNSSI 4009-2015 under COMSEC service authority from CNSSI 4005
The COMSEC Service Authority is the Department/Agency (D/A) senior staff component/command level element that provides staff supervision and oversight of COMSEC operations, policies, procedures, accounting, resource management, material acquisition, and training throughout the D/A. The multitude of responsibilities inherent to the COMSEC Service Authority functions may be allocated to one or more senior staff elements, while specific oversight and execution of selected functional responsibilities may be delegated to subordinate field agencies and activities.
CNSSI 4009-2015 under service authority (COMSEC) from CNSSI 4005