One definition of "Organic" is " Constituting an integral part of a whole; fundamental."
Or,
"Assigned to and forming an essential part of a military organization. Organic parts of a unit are those listed in its table of organization for the Army, Air Force, and Marine Corps, and are assigned to the administrative organizations of the operating forces for the Navy."Dictionary of Military and Associated Terms. US Department of Defense 2005."
yeah, it does sound daft