In part 1 I got a phone ready, in part 2 a home server, and in part 3 an AI that looks after the server for me. But I never checked whether I can actually use any of this in the military. Soldiers' phones get a security app called 국방모바일보안 (Defense Mobile Security), and if it blocks Tailscale or SSH, everything I've built is useless.
The rules
First I looked for the rules. How violations of soldiers' phone rules are punished is set out in the sanction standards for soldiers' phone-use rules in the Unit Management Directive. I read the January 2025 version from start to finish.
| Violation | Sanction |
|---|---|
| Unauthorized photos or recording, Wi-Fi, tethering, GPS or Bluetooth | 30 days |
| Online for-profit activity | 30 days |
| Using the phone outside permitted areas | 14 days |
| Disabling or resetting the security controls | 60 days |
Nothing mentions VPN, SSH or remote access directly. Wi-Fi and tethering are on the list though, so I have to connect over LTE, not the base Wi-Fi. Turning off or deleting the security app is the heaviest one. Units can have their own extra rules, but those aren't public, so I couldn't read them.
I tried installing the app
If the rules don't say, what's left is what the app actually blocks. The soldiers' version is just on the Play Store, so I installed it. The first screen asked for an install code, and I couldn't get past it. The code seems to come from the unit. There was no way for a civilian to test it in advance.
People who've done it
So I dug through communities. At first almost nothing came up, but once I switched Google to Korean results and went through DC Inside, Inven and Quasarzone, quite a lot did.
The closest was a 2024 post by an Army private first class. In a unit without even a PC room, they plugged a keyboard into their phone, used Termius to SSH into their university server, and coded in vim. They said they did it every night until midnight. That's almost exactly what I want to do.
Far more people than I expected remote into their home PC from their phone to play games. On Inven there's a "how to play MapleStory in the military" post by someone discharged in 2024, who says six people in their battalion alone played MapleStory through Steam Link. Among the 81 comments, several said they used Moonlight or Parsec. The cases where people got caught were using remote access on the base PCs, and a keyboard getting flagged in a security inspection.
In October 2026, an active-duty private first class also posted on Threads that they built and launched an app with one phone during about three hours of free time a day. That one wasn't remote access; they used the Claude app and cloud builds.
The one thing left
Game streaming and SSH are the same in that an app connects to my home over the internet. Tailscale is different. On Android it runs as a VPN, and device management apps can block VPNs specifically. The only posts saying "the security app doesn't block VPNs" were from 2021, and the current app is a version re-released in 2026. I never found anyone who had used Tailscale under the 2026 app.
Even if it's blocked, there's a way. My home server already has a Cloudflare tunnel as an emergency route, so I can SSH in through a public address without a VPN. If Tailscale is blocked, I just switch to that route.
Before I enlist
- Connect to the Cloudflare tunnel SSH from my phone with Tailscale turned off
- Buy a one-piece USB-C keyboard with no wireless. I've heard permission for Bluetooth keyboards rarely comes through
- When I first get my phone at my unit, ask the security officer whether I can SSH into my home server
The last one feels the most important. Not being in the rules doesn't make it fine. Having a record that I asked and got permission is what lets me explain myself if anything comes up later.