Jocko Willink former Navy SEAL and Brazilian jiu-jitsu black belt under Dean Lister, one of the most decorated BJJ fighters. Jocko started training Brazilian Jiu-Jitsu in 1995 under Fabio Santos. He is also an owner of MMA Victory training center together with Dean Lister. In this video check Willinks answer on the question about belt pursuit.
Navy SEAL: The Best self Defense martial art is Brazilian Jiu-Jitsu !!