Chapter 5 WH40K: Space Marine Guide

Guardsman Journal 3/5

When you finish fighting with the first orc's team on this stage, stay in front of entrance to the next hangar [1]. You should see skull probe and box with ammo behind your back[2].

Inquisition Report 1/5

Second skull probe you'll find just at the end of the chapter. When elevator goes down, move forward. [1] Over one of the chests you should see the item you need [2].