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"Our Marine friends hooked us up with these. Deployable Plasma Field Generators. Treat 'em just like your weapons. Primary Fire puts one in place, and if there's another nearby, they'll link up to form a wall. Hit Alt-Fire to put down the last one in a chain. Your 'use' reticle will show how much damage it's taken. You can 'use' a wall to walk through it, but if you 'use' a Field Generator, you'll pick it up. Picking up a damaged Field Generator doesn't repair it. When you place it somewhere else, it'll still have the same damage. If you're carrying more than one, the least damaged one will always get put in place first."