From the publication:

The military has always been a key instrument of national power. Its strategic utility for defending the nation and furthering the national interest using direct military force or by assisting friends, allies, coalitions and/or international organizations has earned it a voice in national security policy formulation and implementation. The three traditional services, the Navy, Army and Air Force, have for a long time been recognized as key players in this strategic context. Special Operations Forces (SOF), however, do not share this long history.