The military self-defense system developed for the IDF was derived from the street-fighting experience of a Hungarian-Israeli who was known as what?
Krav Maga: Krav Maga ( ; Hebrew: קְרַב מַגָּע‎ ] , "lit." Krav Maga:  It was derived from the street-fighting experience of Hungarian-Israeli martial artist Imi Lichtenfeld, who made use of his training as a boxer and wrestler as a means of defending the Jewish quarter against fascist groups in Bratislava, Czechoslovakia in the mid-to-late 1930s. Imi Lichtenfeld:  He was also known as Imi Sde-Or, the Hebrew calque of his surname.
Imi Sde-Or