Country/Modifier + 空军
The noun 空军 (kōngjūn) means "air force" and refers to the aviation branch of a country's military. It is used when discussing military branches, personnel, or operations involving aircraft.
他爸爸是空军的飞行员。
tā bàba shì kōngjūn de fēixíngyuán.
His dad is a pilot in the air force.
空军基地离我们这儿大概两百公里。
kōngjūn jīdì lí wǒmen zhèr dàgài liǎng bǎi gōnglǐ.
The air force base is about two hundred kilometers from here.
中国空军近年来发展得很快。
zhōngguó kōngjūn jìn niánlái fāzhǎn de hěn kuài.
China's air force has developed very rapidly in recent years.