Tā zài jǐngchájú dānrèn zhōngduìzhǎng yī zhí duō nián.
He served as squadron leader at the police station for many years.
Tips
usage
中队长 can refer to a leader in military, police, or paramilitary units. 中队 (zhōngduì) is a mid-sized unit — larger than a 小队 (squad) but smaller than a 大队 (battalion/brigade). 长 (zhǎng) means 'chief/leader'.