The noun 老兵 (lǎobīng) means "veteran" or "old soldier." It refers to someone who has served in the military for a long time or has completed their service. For example, 所有的老兵都一样 means "all veterans are the same."
那位老兵每年都会回部队看看。
Nà wèi lǎobīng měi nián dōu huì huí bùduì kàn kàn.
That veteran goes back to visit his unit every year.
老兵们聚在一起回忆当年的日子。
Lǎobīng men jù zài yīqǐ huíyì dāngnián de rìzi.
The veterans gathered together to reminisce about the old days.
爷爷是一位抗战老兵,今年九十岁了。
Yéye shì yī wèi kàngzhàn lǎobīng, jīnnián jiǔshí suì le.
Grandpa is a veteran of the War of Resistance and is ninety years old this year.
那位老兵每年都会回部队看看。
nà wèi lǎobīng měi nián dōu huì huí bùduì kànkan.
That veteran goes back to visit the troops every year.
老兵们聚在一起回忆当年的日子。
lǎobīng men jù zài yīqǐ huíyì dāngnián de rìzi.
The veterans gathered together to reminisce about the old days.
爷爷是一位抗战老兵,今年九十岁了。
yéye shì yī wèi kàngzhàn lǎobīng, jīnnián jiǔshí suì le.
Grandpa is a veteran of the War of Resistance; he's ninety years old this year.