This is the 9917th most frequent Korean word.
공군에는
"In the Air Force."
Here, '공군에는' specifies the air force as the subject or topic (using '에는') to provide information about it, namely that it has many types of jobs.
공군에는 다양한 직업이 있습니다.
The air force has various jobs.
In this sentence, '공군에는' is used to introduce the air force as the topic to describe its departments, specifically the one responsible for flying helicopters.
공군에는 헬리콥터를 조종하는 부서도 있습니다.
The air force also has a department that operates helicopters.
'공군에는' introduces the air force to discuss the rules applicable in its context.