For the last Spartan Core in Outpost Tremonius, return to the ship's exit point and fight your way through the enemies in the encampment. The container is behind the structure on the left side of the ...

The next Spartan Core in Outpost Tremonius can be found after exiting the ship. Immediately turn right and follow the right side of the ship. You'll see the crate next to a single dead tree, ship ...