This is the 1535th most frequent Korean word.
공군은
"공군은" means "The Air Force is" in English.
Here, '공군은' serves as the subject of the sentence, referring to the air force in a general context.
공군은 국가의 방위를 책임지고 있습니다.
The air force is responsible for national defense.
In this instance, '공군은' identifies the air force as the main actor performing the action of introducing new equipment.
공군은 새 전투기를 도입했습니다.
The air force has introduced new fighter jets.
This usage of '공군은' specifies the air force in comparison to other military branches, focusing on its primary operations.