Modern history of East Asian martial arts
Taekwondo was developed from karate for use in the Republic of Korea Armed Forces from 1954. For this purpose, karate terminology needed to be "nationalized". The name "taekwondo" is due to shotokan practitioner and army general Choi Hong Hi. After the Korean War, Taekwondo was further developed into a purely sportive discipline, since 1973 overseen by the World Taekwondo Federation. 
During 1964-1966, Choi Hong Hi continued to promote taekwondo, working to put together a world-class exhibition team. Taekwondo's emphasis on jumping and flying kicks dates to this period. While taekwondo was based off karate, the structural changes made in the 1950s and 1960s were significant, and it cannot now be considered a branch of karate, but is a standalone modern martial art. Taekwondo was presented at the Summer Olympics as a demonstration sport in 1988 and 1992, and became an official Olympic discipline in 2000.
Taekwondo at the 2012 Summer Olympics
A total of 128 athletes from 63 nations competed in taekwondo at the London Games. Only six nations brought four athletes: Egypt, Great Britain, Korea, Mexico, Russia, and the United States.
British taekwondo practitioner Aaron Cook was involved in controversy relating to selection for the games. Although ranked number one in the world, Great Britain decided to send Lutalo Muhammad, ranked 59th. Cook appealed the omission claiming that he was overlooked because he stepped outside of Britain's training program and found his own coach, but the World Taekwondo Federation found that no rules were broken during the selection process.