部队 (bùduì) is a noun meaning "troops," "armed forces," or "military unit." It refers to organized groups of soldiers or military personnel. It is a general term used across military contexts and can refer to units of any size, from a small squad to a large army corps.
部队正在紧急赶往灾区救援。
Bùduì zhèngzài jǐnjí gǎnwǎng zāiqū jiùyuán.
The troops are urgently heading to the disaster area for rescue.
他在部队待了八年,退伍后回了老家。
Tā zài bùduì dāi le bā nián, tuìwǔ hòu huí le lǎojiā.
He spent eight years in the military and returned to his hometown after being discharged.
这支部队的战斗力非常强。
Zhè zhī bùduì de zhàndòulì fēicháng qiáng.
This unit has very strong combat capability.