Professor Ronald Duncan was (and is) a legend in the Martial Arts world. He's often credited as The Father of American Ninjitsu. Duncan was U.S. Marine and had many different black belts in numerous forms of armed and unarmed Martial Arts.

This video has gone viral as of late, with the push of being shared all over Facebook. Although a lot of the comments have been other than pleasant, many of the younger crowd are oblivious to Duncan's contribution to Martial Arts. He not only trained Navy S.E.A.L. Special Teams, but also law enforcement and government agencies around the globe. You can even see his influence in action cinema. Check out fight scenes in movies like The Bourne Supremacy and many of Steven Seagal's earlier works that utilize the rolled magazine as an offense weapon.

R.I.P. - Grandmaster Ronald Duncan