军人负责国防安全。

Jūnrén fùzé guófáng ānquán.

Soldiers are responsible for national defense.

我们需要强大的国防。

Wǒmen xūyào qiángdà de guófáng.

We need a strong national defense.

国防是国家的重要任务。

Guófáng shì guójiā de zhòngyào rènwù.

National defense is an important task of the country.