Sport Sambo (Russian: Борьбa Самбо, Bor'ba Sambo, Sambo Wrestling (eng)) is stylistically similar to Olympic Freestyle Wrestling or Judo, but with some differences in rules, protocol, and uniform. For example, in contrast with judo, Sambo allows some types of leg locks, while not allowing chokeholds. It focuses on throwing, ground work and submissions, with (compared to Judo) very few restrictions on gripping and holds. Combat Sambo (Russian: Боевое Самбо, Boyevoye Sambo). Utilized and developed for the military, Combat Sambo resembles modern mixed martial arts, including extensive forms of striking and grappling where (unlike Sport Sambo) choking and bent joint locks are legal. Competitors wear jackets as in sport sambo, but also hand protection and sometimes shin and head protection. The first FIAS World Combat Sambo Championships were held in 2001. Freestyle Sambo -- uniquely American set of competitive Sambo rules created by the American Sambo Association (ASA) in 2004. These rules differ from traditional Sport Sambo in that they allow choke holds and other submissions from Combat Sambo that are not permitted in Sport Sambo as well as certain neck cranks and twisting leg locks. Freestyle Sambo, like all Sambo, focuses on throwing skills and fast ground work. No strikes are permitted in Freestyle Sambo. The ASA created this rule set in order to encourage non-Sambo practitioners from judo and jujutsu to participate in Sambo events. Sambo's early development stemmed from the independent efforts of Vasili Oschepkov and Victor Spiridonov, to integrate the techniques of judo, jujutsu, and other foreign martial arts into native wrestling styles. Oschepkov taught judo and karate to elite Red Army forces at the Central Red Army House. Vasili Oschepkov was one of the first foreigners to learn Judo in Japan and had earned his nidan (second degree black belt, out of then five) from judo's founder, Kano Jigoro. Spiridonov's background involved indigenous martial arts from various Soviet regions as well as an interest in Japanese jujutsu (though he never formally trained it). His reliance on movement over strength was in part based on the fact that he received a bayonet wound during World War I which left his left arm lame. Both Oschepkov and Spiridonov independently hoped that Soviet military hand-to-hand combat techniques could be improved with an infusion of the techniques distilled from other foreign martial arts. Contrary to common lore, Oschepkov and Spiridonov did not cooperate on the development of their hand-to-hand systems. Rather, their independent notions of hand-to-hand combat merged through cross-training between students and formulative efforts by their students and military staff. While Oschepkov and Spiridonov did have occasion to collaborate, their efforts were not completely united. Each technique was carefully dissected and considered for its merits, and if found acceptable in unarmed combat, refined to reach Sambo's ultimate goal: to stop an armed or unarmed adversary in the least time possible. Thus, many techniques from jujutsu, judo, and other martial systems joined with the indigenous fighting styles to form the Sambo repertoire. When the techniques were perfected, they were woven into Sambo applications for personal self-defense, police, crowd control, border guards, secret police, dignitary protection, psychiatric hospital staff, military, and commandos.