"These authorities authorize the FI and CI elements of the Army, Navy, Air Force, and Marine Corps to collect,
produce, and disseminate military and military-related FI and CI, and information on the foreign aspects of narcotics
production and trafficking. Implicit in this authorization is a requirement that such intelligence relate to the activities
of foreign powers, organizations, persons, and their agents (including U.S. persons). Because domestic support
operations rarely involve foreign powers, organizations, or persons, military intelligence organizations typically
have little or no role to play during such operations.
In the absence of any foreign involvement, military intelligence organizations are generally limited to performing
non-intelligence functions in a domestic support operation. Moreover, to the extent that military intelligence
organizations are authorized to collect FI or CI within the United States, they may do so only in coordination with
the Federal Bureau of Investigation (FBI), which has primary responsibility for intelligence collection within the
United States. It is important to remember that the Lead Federal Agency (LFA) exercises overall responsibility for
the collection, analysis, and dissemination of information concerning the operating environment"
https://www.hqmc.marines.mil/Portals/146/Docs/intel%20oversight/Chapter%209%20(Excerpt).pdf