Brief description
Master Sergeant Farrell is in a trench with fellow soldiers and as he peeks over to look for aliens we can see through his helmet camera that there are aliens coming towards them. The aliens aren't clearly visible as they are hidden in clouds of dirt (they burrow into the ground to move around sometimes) but the camera identifies the aliens and also tracks their movement.
The sergeant is presented as a fairly passive user, with the helmet doing the work - the soldiers don't seem to activate anything on the suit except when they reload a weapon or similar. The helmet acts on its own and the soldiers observe and follow directions.