Semen Israelovich Kogan was born on November 18, 1921. He spent his childhood and youth in Simferopol. At the age of sixteen, he began working as an acrobat in the circus, performing with a circus troupe under the Mobile Circus Administration. However, during one of his performances, he fell and broke both arms. After the fractures healed, the doctor told him, "Young man, don’t even think about continuing your craft. If you break them again, you might lose an arm or even both."
After this incident, Semen and his friend and acrobatic partner, Fima Rozbaum, decided to enroll in the Odessa Higher Combined Arms Infantry School named after K. E. Voroshilov. In 1939, they successfully passed the entrance exams and began their studies.
Just before his graduation in 1941, the war broke out. The school formed a combined battalion of cadets, which was sent to the Prut River to cover the retreat of the Primorsky Army. Thus began the long military journey of S. I. Kogan: