To get through the Military Camp Gate in Hell Is Us, you’ll need a specific code. The camp is in the Acasa Marshes, which is northeast of Jova. You can’t get the code right away. It only becomes available after you’ve collected two of the four Keystones you need to finish the main story.
This can get confusing, and it’s easy to be thrown off by all the work of getting the code. This isn’t as easy as the code for vitalis’ basement, but it’s simple enough. Luckily, all you need to do is make sure to follow a few easy steps, and the code will be yours.
What Is the Gate Code to the Military Camp Gate in Hell Is Us?

When you get to the metal gates, just punch in the code 151991, and the gate should open up for you. You can get the code by heading to Ascasa Marshes Military camp. Once you’re inside, you can mess with the computers in the tents near the gate, but watch out because more enemies will probably be waiting inside for a warm welcome.
Also, don’t miss the valuable stuff next to those PCs, like rods for the Lymbic Chests. If you explore more of the island, you’ll find a cave with a weird door and some lamps. You’ll need to open another hidden door in Jova’s well system. Just like we saw with our first impressions of the game, it’s not as simple as putting in the code the first time.
Where to Find the Acasa Marshes Military Camp

Getting to the Acasa Marshes Military Camp is a bit of a trek. First, you’ll want to head to the northeastern part of the Acasa Marshes, which is northeast of Jova. To get your bearings, find the blacksmith and the ON outpost nearby. Once you spot the blacksmith, take the path next to it that leads toward a building with a big “ON” on the roof and a flag flying.
From there, take the path to the right of the building, and it will lead you down into the marshy area. Now, be careful as you head into the marshes because you’re definitely going to run into some hostile enemies. There’s a particularly big group that will ambush you as you make your way to the camp. Keep going until you see some large ruins on an island. As you get closer, you’ll start seeing military gear like APCs (Armored Personnel Carriers) and tents, so you’ll know you’re close.
How to Get the Military Camp Gate Code

If you’re trying to get into the Military Camp in Hell Is Us, you’ll need to know the gate code. You can’t just find it right away, though; you have to play through a big chunk of the main story first. The code only becomes available after you’ve collected two of the four Keystones you need to finish the main quest.
The first Keystone is pretty easy to get early on when you reach the Vyssa Hills. The next three, however, require a lot more exploration and searching. Once you have two of the Keystones, go to the APC and you’ll find the code under the seat. The one for the military camp gate is the 14th combo on that list.