Tzviel ‘BK’ Blankchtein served in the Israeli Defense Forces as an infantry reconnaissance team member from 1993 to 1997. He was honorably discharged upon completion of mandatory service as a sergeant first class. BK’s expertise includes firearms, tactical operations, hand-to-hand combat, amphibious assaults, operational security in hostile areas, intelligence and counter-intelligence operations, and tactical trauma care. Today, BK operates four companies, specializing is tactical training, self-defense/defensive-tactics, and security and protective services. BK’s training is considered to be the leading in reality base training for law-enforcement, military, secuirty companies, and civilians.