Detailed mission walkthrough:
You'll start the mission inside the main facility, near the garage area. Take your time and allow the game to display your first objective.
New mission objective: Proceed to upper floors and locate weapons database server
There's a console to your left. Approach it and press a button. Not only will you open the door, but you'll also receive further orders.
New mission objective: Disable alarm system in security room
There are three enemy soldiers near the gate. The easiest way to get rid of them would be to hide behind the left wall. Next, wait for them to get here. Activate one of your powers and kill them with a machine gun or a shotgun.
The security checkpoint is to the right. You will have to get there in order to disable the alarm. There's only door here, so you shouldn't have any problems finding it. You'll come across a weapons locker here. Open it if you're low on ammo. Next up, you will have to approach the main console. You'll find a button here (screen). Press it and wait for further instructions.
New mission objective: Gain access to loading dock storage area
Don't leave this room right away. A gate has been opened in this area. This means you will have to deal with several new soldiers. One of them will probably try to enter the security checkpoint. It would be a good idea to take his gun with a little help from your suit. Wait for the power bar to regenerate itself. Stop the time once again and kill a soldier who is using a heavy machine gun post (screen). He is standing to your right. Once he's gone, kill the rest of the enemy soldiers.
Familiarize yourself with the heavy machine gun post and the vehicle, because you'll have to return here in just a few seconds. Head on to a nearby corridor which is the only path leading to your new destination. You'll come across a large group of enemy soldiers. Go back to the armored car quickly and use the heavy machine gun post. Kill the soldiers with it (screen).
Go back to the secured corridor. More enemy soldiers are standing in front of your current position. Sadly, you don't have too many places to hide here, so make sure that you're using one of the powers of your suit in order to gain a much needed advantage over enemy troops. Now you will have to turn left. There are some explosive barrels in this area. Destroy them to kill some of the surrounding enemy units.
Keep shooting at the enemy soldiers, however you shouldn't be trying to move towards them right away. Instead, turn left and explore this area. You will come across a crate here (screen). I'm sure that you've noticed it before, but you couldn't get to it back then. Now's your chance.