taekwondo1-3, Exercise 2: The naming

Model answer:

Sequence (per the Taekwondo article):
1. 1952: President Syngman Rhee watches a demonstration by Army officers Choi Hong-hi and Nam Tae-hi, takes it for taekkyon, and urges one system for the army.
2. From 1955: the kwan leaders discuss a unified Korean art. Until then "Tang Soo Do" meant Korean karate (written with the characters of the Japanese karate-do); "Tae Soo Do" was also used for a unified style.
3. Choi advocates "Tae Kwon Do", the name closest to the pronunciation of "taekkyon". It is slow to catch on among kwan leaders.
4. The South Korean military adopts taekwondo, which increases its popularity among civilian schools.

Meanings: Tae Soo Do = tae "to stomp, trample" + su "hand" + do "way, discipline". Tae Kwon Do replaces su "hand" with kwon "fist" (also the term for "martial arts" in Chinese, quan).

(The Choi Hong-hi article adds that it was "so named on 11 April 1955"; only that article gives this date.)

Sources: Wikipedia, Taekwondo; Choi Hong-hi.