(Spoilers) Expedition Camp protection

[Tayon]

Marcus gives us the task of finding all kinds of things that can improve the protection of the camp.
I found:
Turret activation. Security computer inside the ruins.
Naga Protector. A statue in the southeastern part of the island, checks for hacking and electronics, you need a spare plasma core. I still don't understand - why in a camp full of specialists and researchers I can't ask anyone to fix the statue for me? I understand that this advantage can be made specifically for crafters, but still I wanted the opportunity itself to ask for help from, for example, Marcus, albeit to no avail.
Navy mines. Search in LemKO. Then ask the Ferryman to transport them.

Has anyone found anything else?

[Threeeightnine]

Something I wish had occurred  to me right away: cover the beach with bear traps and mines. Ladleman sells 15 bear traps every time he restocked. That drastically improves the fights.

[harperfan7]

bear traps, caltrops, mines
throw toxic gas when you enter during an invasion, before the fight starts (or wait until it does, since you used all those bear traps)

I haven't tried it yet, but I had an idea to just surround the landing zones with rings of bear traps, that way you can get close to throw grenades or whatever you do.  My method of putting down all those bear traps and caltrops over the beach kinda backfired when I couldn't really get to the crossbowmen who were sniping the troopers.  Also, throw flares so your dumb trooper buddies can actually hit something.

[patata2]

I used like 6 calltrops + the ones with the stun poison, much easier fights after that.

The crossbow guys are the real danger, they hit like a truck.