The green slashes on his shoulders is a sign that he is the leader in the squad. That badge is the name of the squad. From far, you’ll know he is the leader for squad 23.
I used the wrong terms for the tweet above. Refer to this tweet.
To make other people understand what a company leader means, Junmyeon is the leader of company 6.

Idk how many platoon in a company but this is just an example image to explain what is in charge of... you’ll the big picture...
It is also possible that the colour of slashes carries the names of the company. Like the Green Company. Idkidk.
I need to put under this thread

https://twitter.com/kjm01sh522/status/1265251670058926082?s=21 https://twitter.com/kjm01sh522/status/1265251670058926082
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