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The FBI is a law enforcement agency, and like practically every LE agency, their primary hand-to-hand combat training curriculum is their own concoction, which they call "defensive tactics" (DT for short). The focus is on arrest and control tactics and "officer safety". As far as what actually goes into it, and what it looks like, most of the answers you've received so far are on the dot: Vunak's PFS, krav maga, and also Blauer Tactical Confrontation Management Systems are among the systems well known to their instructors, and integrated into their training.
Aikido and jujitsu help with arrest and control systems, and that's a big part of the DT training. Also bear in mind that FBI agents use weapons, so they train with the expandable baton, handguns, OC, even rifles and carbines, etc. In addition to the "core" training received by agents in the academy, agents may receive ongoing training on an as-needed basis, either as refreshers, upgrades, or for specific duties they're called on to perform. So for instance, if some guy says he taught Brazilian Jiu-Jitsu to the FBI, he could well be telling the truth.
But that doesn't mean that it's the FBI's official system. I know, for instance, that ISR Matrix weapons retention and arrest tactics have been taught to FBI agents... but it's not been "adopted" as "the official system" of the FBI. I think another arrest and control system called LOCKUP has been commissioned by the agency to be taught on a similar "seminar" basis.
No martial arts system--including krav maga... including PFS--has been adopted as "the official system" for the FBI. The DT trainers have been trained in all that stuff. They all know krav, and JKD, and all that.
They know what they're doing. And they also understand what agents need to be able to do in order to do arrests and keep safe. If you want to do self-defence/martial arts training, learn stuff that's both athletic and practical.
PFS, JKD, and krav maga are all fine, and they're popular systems that are easy to find. Doing some MMA training would be great, too. I am personally a fan of the SBG stream of JKD, as well as ISR Matrix, Blauer Tactical, and Kelly McCann's combatives.
And I love BJJ myself. Do stuff that you enjoy, will get you in top shape, and will cultivate a good base of combat skills. And when you show up at DT class, "empty your cup" and trust your instructor.
They train all federal law enforcement agents at the FLETC.. they all train in the same styles.. I have heard that Israeli Trainers come over for krav maga, I know they use a mix of other arts too, Aikido and Jujitsu being prominent. They do a lot of grappling arts so that they end up detaining and not incapacitating every person they come by.. I know the HRT gets more extensive and intense training in krav maga for the situations they face.. I mean the Israelis wrote the book on hostage rescue in 1977 or so. A lot of people mistake their training as MMA cause it is varied, but they use techniques that exceed the parameters of MMA.
I would personally wait for them to teach you krav maga in the FLETC, that way you don't have to worry about running into a scam (mcdojo) for krav maga, they are becomming more and more prevailent in recent years and can get expensive compared to how crappy the teaching is.. there are some good schools, but why pay for something you can get for free later on, get into a good dojo no matter what the style and it will still give you an advantage for the FBI.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.