CQC closely resembles other martial arts such as judo or jujitsu. This was supported by both Colonel Volgin and Major Ocelot, who, at various encounters with Naked Snake, quoted "I've had enough of your judo!!" (Ocelot, Rassvet), and "What was that? Some kind of judo?" (Volgin, Groznyj Grad). Moves displayed by Snake and The Boss also closely resembled certain judo moves. Judo was made an official sport during the 1964 Tokyo Olympics a few months (October) after Operation Snake Eater (August).