Is that a Japanese Special Forces troop covertly monitoring nefarious terrorist activity? Well, not exactly. It's all about catching illegal trash dumpers:
When they find an illegal dumping site, they send a stakeout team to watch the spot so that anyone who tries to dump again in the same place will be caught in the act. Because the dumping takes place in wooded mountainous areas, the cops wear camouflage and sneak around like commandos. [...]
The police stakeout shown in the video drags on for 88 days until they finally arrest one man who is dumping a small load of trash.
Japan Probe has the video clip: Link [embedded Daily Motion, in Japanese, but you'll get the gist]