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Combat support agency (CSA) is a designation by theUnited States Department of Defense (DoD) of those defense agencies that provide department-level and tactical support to the U.S. military during combat operations. The designation was first outlined by theGoldwater-Nichols Department of Defense Reorganization Act of 1986, with subsequent additions based on the department's needs.
There are currently eight agencies designated as CSAs. This includes severalintelligence agencies under DoD, which have a national mandate in addition to their departmental combat support role.[1]