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Move back down the steps and swap your plasma pistol for a needle rifle. If necessary, restock health within the small room that contains a health kit, sprint, a frag grenade, and an assault gun crate. Once you're able to continue, walk to the sting of the massive hole within the roof, where you'll see three Grunt spec ops below you. Kill all of them with needle rifle headshots, before jumping through the opening . On the extent below, there are three more Grunt majors, so kill all of them together with your needle rifle once you jump through the opening . Through subsequent door, you'll find two health kits, a plasma launcher, a plasma pistol and needler crate,