他是一名空军飞行员。

He is an ___air ___force pilot.

白天，你可以参观空军基地，它从9:00开放到6:00。

During the day, you can visit the ___air ___force base, which is open from 9:00 to 6:00.

空军在现代战争中扮演着关键角色。

The ___air ___force plays a crucial role in modern warfare.