Student soldiers in the Korean War – Wikipedia

Student soldiers (Korean: 학도병, romanized: Hagdobyeong) were students that fought for South Korea during the Korean War from June 1950 to March 1951. Students volunteered or were conscripted into the Republic of Korea Army as emergency troops to fight against North Korea’s invasion of South Korea.The invasion triggered the conflict and almost overran the country.

https://en.wikipedia.org/wiki/Student_soldiers_in_the_Korean_War