Krav Maga, lit. "contact combat" or "close combat") is an eclectic hand-to-hand combat system developed in Israel. It was derived from street-fighting skills developed by Imi Lichtenfeld, who made use of his training as a boxer and wrestler, as a means of defending the Jewish quarter during a period of anti-Semitic activity in Bratislava in the mid- to late 1930s. In the late 1940s, following his immigration to Israel, he began to provide hand-to-hand combat training to what was to become the IDF, developing the techniques that became known as Krav Maga. It has since been refined for both civilian and military applications. Unlike most martial arts, Krav Maga is essentially a tactical defense skill. Its philosophy emphasizes threat neutralization, simultaneous defensive and offensive maneuvers, and aggressive endurance in a 'him-or-me' context. Krav Maga is still used by the Israel Defense Forces and several closely related variations have been developed and adopted by law enforcement, Mossad, Shin Bet, FBI and United States special operations forces. There are several organizations teaching variations of Krav Maga internationally.