Benjamin,
I fully agree with your last.
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in the united states,it is written in many publications that 3-4 percent of the population trains in a martial art.
Of that 4 percent the majority have trained in TMA's ,arts or systems that are now life long persuits,arts that take years to learn and master.
Then we have niche markets such as MMA,BJJ,and so called military styled arts.
Of the military arts WWII combatives is probably below some but on par with most,but combatives is losing ground slowly.
Why?
Because as Ben and others have pointed out ,it is seen as being too violent by many,it is,(in the wake of these so called modern combatives) to be antiquated,while many of the so called newer combatives are sport and not true Self Defense,people can relate to them more as the alternatives declared are being able to prevent,injur or perhaps kill,while combatives is geared soley to kill or to seriously incapicitate the opponent.
Also today,WWII combatives is seen as a niche,it is done by so called Hard Core people who only want to Kill,but the problem is we are moving away from the base system WWII combatives provided.
The teachers today have developed their own systems of combatives,(not that it is wrong) but they added and took away what they felt important or not (as many practioners who do not stay traditional do) and this has caused too much diversity,though the base in most is the same.
Biddle was different than Fairbairn,who was different from Applegate,who differed from O'Neil,who differed from Underwood,who was different to Nelson,who differed from Karry,who differs from Steiner,who differs from Cestari,who differs from McCann who differs from Todd,who differs from Perkins,who differs from Morrison on and on.
Then we add in no compete clauses when people live hundreds to thousands of miles from their instructors so that causes changes by those who want to teach.
The niche is so small and the products so different and many have a product and decide to call it WII Combatives,(which is rare) though they insinuate it contains the main points of WWII ,FAS style,combatives,but then you have Defendo (which Wolfe does which is Hapkido over WWII materials) to defendu,to combato,combatu,attack proof on and on,it is different and changes from instructor to instructor.
Krav Maga though it has differences all claim to be the art of some form of israeli combat structure.be it civilian combat against terrorists to Police,to border patrol,to the military,to special ops units of military,so even though some some of Krav maga looks like TMAs like Tae Kwon Do or Karate,others look like Judo/Jujitsu,others still resemble boxing and wrestling mix,but it all lives and is promoted under one banner Israeli Military arts,this has peeked a section of the populace but as said it is a small percent of the 4 percent who train in any art.
If we said which system of so called military H2H would be the easiest to teach and produce effective Practioners thenWWII combatives would win hands down.
But
Are people willing and prepared to just study and train a Killing art with no other choice in the mix of outcomes?
WWII combatives is good for its intended purpose to be taught and used on a true battlefield,use on the street presents more liabilities and this is even said by practioners such as Cestrai who advise training in arts like judo ,jujitsu or boxing ,to add to the mix of outcomes available.