Question: What man, also known as mi Sde-Or, created a military self-defense system developed for the Israel Defense Forces?
Related documents: [0]  [DOC] Emrich "Imi" Lichtenfeld (May 26, 1910 – January 9, 1998) was a Hungarian-born Israeli martial artist who founded the Krav Maga self-defense system. He was also known as Imi Sde-Or, the Hebrew calque of his surname. [END] 
[1]  [DOC] Krav Maga ( ; Hebrew: קְרַב מַגָּע‎ ] , "lit." "contact-combat") is a military self-defense system developed for the Israel Defense Forces (IDF) and Israeli security forces (Shin Bet and Mossad) that consists of a combination of techniques sourced from Boxing, Wrestling, Aikido, Judo, Karate along with realistic fight training. Krav Maga is known for its focus on real-world situations and its extreme efficiency and brutal counter-attacks. 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. In the late 1940s, following his migration to Israel, he began to provide lessons on combat training to what was to become the IDF. [END] 
Answer: 
Emrich "Imi" Lichtenfeld
Emrich "Imi" Lichtenfeld