This is the 7109th most frequent Korean word.
제대한
"제대한" means "discharged from military service."
Here, '제대한' is used to describe the subject's action of being discharged from military service, functioning as a past participle in the sentence.
그는 군에서 제대한 후 대학에 진학했다.
After being discharged from the military, he pursued a college education.
In this case, '제대한' qualifies '군인들' (soldiers), describing them as those who have been discharged from military service, functioning as an adjective.
제대한 군인들이 사회에 성공적으로 적응하고 있다.
Discharged soldiers are successfully adapting to society.
Here, '제대한' is used in combination with '날' (day) to specify the event's relevance, acting as a descriptor for the time when the discharge occurred.