Talk:Re: Chapter 164/@comment-217.209.94.177-20180312162220/@comment-10733658-20180313000225

That it is!

https://en.wikipedia.org/wiki/Japan_Ground_Self-Defense_Force

Based on the information from that wiki, we can assume this is the 1st Infantry Regiment, 1st Division, Eastern Army. That is the force responsible for Tokyo and the surrounding area, based out of Camp Nerima (so, 20th Ward).