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In page Krav Maga:

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After making his way to Mandatory Palestine, Lichtenfeld joined the Haganah paramilitary organization.[4] In 1944 Lichtenfeld began training fighters in his areas of expertise: physical fitness, swimming, wrestling, use of the knife, and defense against knife attacks. During this period, Lichtenfeld trained several elite units of the Haganah, including the Palmach (striking force of the Haganah and forerunner of the special units of the Israel Defense Forces) and the Palyam, as well as groups of police officers.[citation needed]