Mission 1 | Collectibles Enemy Front Guide

The location of the first collectible.

The first collectible is next to the first fork in the sewers (right after you descend into the sewers).

The location of the second collectible.

The second collectible is inside the German building in the room full of cardboard boxes, on one of the shelves

The location of the third collectible.

The third collectible is in one of the rooms in the small building, on the yard in the second stage of the mission (after you exit the sewers, climb up the stairs, to the higher floor, or across the hole).