Manual (FM) 31-20 is the Special Forces (SF) principles manual.
It is directly linked to and must be used in conjunction with
the doctrinal principles found in FMs 100-5 and 100-20 and
the projected FM 100-25. It describes SF roles, missions,
capabilities, organization, command and control, employment,
and support across the operational continuum and at all levels
of war. It provides the authoritative foundation for SF subordinate
doctrine, force design, materiel acquisition, professional
education, and individual and collective training.