"The two most knowledgeable guys on this area I am aware of are Alan Alsleben, who posts here occasionally, and Akira Takizawa in Japan, ditto. In ALL instances I would defer to their knowledge on this subject."
A website about the SNLF, credited to Allan Alsleben, Akira Takizawa and another fellow.
http://www.9thimperialmarines.com/JSNLF.html
Note the statement that the 2nd Yokosuka SNLF in a first incarnation WAS a parachute unit.