Jocko Willink -
Navy SEAL / American Hero

You will notice in the video he not once mentions Tae Kwon Do / Taekwondo or karate but alludes to them in the end because they are not effective as a true self defense in real world applications. This is coming from someone who made a career out of learning effective arts out of necessity for survival. Tae Kwon Do / Taekwondo and karate have done a great job of marketing over the years and promoting discipline with cool katas and board breaking displays but BJJ creates true discipline and humility for success in life.