Level 5: Assault on the Control Room

Active Camouflage 1: Found to the right behind some crates, just before descending the slope into the cave. This is in the area past where you find the Scorpion tank.

Active Camouflage 2: After exiting the cave during the 'Rolling Thunder' segment, stay to the right. You'll find a Ghost, health, ammo, and a Covenant turret. Enter the building to the left of the turret's slope. Inside a larger room with two poles, the Active Camouflage is located here.

Active Camouflage 3: Continue past the second Active Camouflage until you reach the next group of marines at the bottom of a cliff. Past them are Hunters and the entrance to the next area, marked by several pillars. To the left of these pillars, you'll find health, ammo, and an Active Camouflage.

Active Camouflage 4: Proceed from the third Active Camouflage into the next area. Ascend and move through the dual bridges. After the bridges, you'll enter a hallway with invisible Elites. Look for an interior section on the left side of this hallway (relative to your progression direction). Within this passage, behind some poles sticking out of the wall, is the final Active Camouflage.