From the Document: "Security Force Assistance (SFA) is defined as 'unified action to generate, employ, and sustain local, host nation or regional security forces in support of a legitimate authority.' By definition 'security forces include not only military forces, but also police, border forces, and other paramilitary organizations, as well as other local and regional forces.' SFA involves organizing, training, equipping, rebuilding, and advising foreign security forces (FSF)."
CRS In Focus, IF10675
Congressional Research Service: https://crsreports.congress.gov/