'The influence that Lang’s book would come to have on various civilian, police and military training programs worldwide was considerable. During 1943 Charles Yerkow wrote the book “Modern Judo – The complete Ju Jitsu” which came to be included as a supplemental manual for the United States Army hand to hand combat teams. The books chapter on stick work is based on Lang’s walking stick method of self-defence.
In 1941 Lang’s manual was translated into Hebrew and for a period of time was adopted into the Kapap syllabus later to be included as part of the training undertaken by Israeli special units known as Pal’mach. It is estimated that up to 50 000 (and possibly more) Jewish citizens received tuition in the walking stick method.'
Noah Gross