This is the 6432nd most frequent Chinese word.
排长
Platoon leader.
The word "排长" denotes a military rank of a platoon leader in this sentence, showing leadership ability.
排长正在组织士兵进行训练。
The platoon leader is organizing soldiers for training.
Here, "排长" refers to an individual holding the rank of platoon leader, involved in tactical planning.
昨天晚上，排长和我们的班长在讨论任务安排。
Last night, the platoon leader and our squad leader were discussing the task arrangement.
In this sentence, "排长" is used to talk about the qualities of a newly appointed platoon leader.