Such as the following:
Walking Cache: Allows you to pick up ammo in weapons on the ground.
Trigger Happy: Doubles your rate of fire.
Blindfire: When shooting enemies from the front, produces an opaque patch on their visor.
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[quote] Walking Cache: Allows you to pick up ammo in weapons on the ground.[/quote] Don't you already do this? The other two are pretty much campaign skulls and Blindfire is one?