Progressive Fighting System (PFS) is a combat system created by Paul Vunak and based on Jeet Kune Do.
The PFS is considered a very effective system in fighting road, with the importance given to the heads , knees , elbows and the trapping . These techniques form the basis of what is the
RAT program , the combat system taught to American special forces, developed their own with the help of Vunak. Vunak has always maintained that it does not teach JKD superior techniques,
but develops a combat effective and superior attributes. There are superior techniques in martial arts, but training methods above. And according to what it claims Vunak, techniques of
JKD are taken from other martial arts.