Difficulty levels change the enemy soldiers' abilities.
In this mission you will have to face 15 Juggernauts, appearing at random spots on the platform. The area is very big and provides lots of cover. Additionally you have more weapons to choose from. The most useful are the sniper rifles, thanks to which you will be able to eliminate the Juggernauts from afar as well as from a smaller distance. The tactic is quite simple, nevertheless taking out all fifteen the first time you try this mission can be quite troublesome.
Focus mainly on using flash grenades and the sniper rifle. Once you see a Juggernaut, throw a flash grenade and blind him. Afterwards start shooting at him with the sniper rifle. Repeat this tactic until he falls. As you can have only four grenades at a time, you will have to quite often go to ammo boxes to get more.