You have to find two additional caches. The caches are spread randomly among the camps. Each cache will be marked with . If a camp doesn't have a cache, the camp might have one the next time Ryder visits. If a camp has a cache, SAM (or a squadmate) will comment on the presence of the cache.
When Ryder has found three caches, the mission will update to the next objective.
Got almost all the weapon caches accounted for. I'll forward them to your camp as soon as I have the manpower for it. Not sure you need all this for one weakling colony, but it's your choice.
Fuck, Prodromos won't know what hit them. They'll be dead before they can lift a finger. I envy the loot you'll score from that one. Let me know when you get back from Eos.
Someone has been hoarding weapons for an attack on Prodromos.