This is the 2007th most frequent Korean word.
병역
"병역" means "military service" in English.
In this sentence, "병역" refers to the mandatory military service duty in South Korea.
그는 병역 의무를 성실히 수행했다.
He diligently fulfilled his military duty.
Here, "병역" is used to denote the concept of military service as a governmental obligation.
병역 면제는 특별한 조건에서만 허용된다.
Exemption from military service is only granted under special conditions.
In this context, "병역" signifies the societal and national significance of compulsory military duties.